In the world of K-dramas, getting the second lead can sometimes feel like a consolation prize.
The character may not get the final confession, the grand kiss or the happily-ever-after ending. But every so often, the supposedly “second” character becomes the one viewers remember most.
That phenomenon—often called second-lead syndrome—has helped turn several supporting performers into some of Korean entertainment’s most recognisable stars.
Some broke out by making audiences root against the official love triangle. Others used supporting roles to prove they could handle comedy, romance, action, psychological drama and even villainous characters.
And for eight K-drama stars, the second-lead era eventually became something much bigger.
Here are the actors and actresses who went from scene-stealers to bona fide leading stars.
1. Byeon Woo-seok: From ‘Record of Youth’ to ‘Lovely Runner’
Before he became one of the biggest breakout names of the recent K-drama wave, Byeon Woo-seok spent years building his résumé through supporting roles.
His major step forward came in ‘Record of Youth’ (2020), where he played Won Hae-hyo, the wealthy model and actor who is also Park Bo-gum’s character’s best friend.
But the role that changed everything came in 2024.
In ‘Lovely Runner’, Byeon Woo-seok finally took centre stage as K-pop idol Ryu Sun-jae opposite Kim Hye-yoon. The time-travelling romance became a major global hit and transformed him into a leading-man favourite.
His versatility was also on display in ‘Strong Girl Nam-soon’, where he played the villain Ryu Si-o.
Then came another major milestone in 2026.
Byeon Woo-seok starred opposite IU in ‘Perfect Crown’, playing Grand Prince I-an. The Disney+ release reportedly accumulated 43 million streaming hours globally in its first 28 days, according to figures cited by Philippine Star.
His next major challenge is even bigger: Netflix has confirmed a live-action ‘Solo Leveling’ adaptation with Byeon Woo-seok attached to play Sung Jin-woo.
From second lead to: international leading man.
2. Kim Seon-ho: The ‘Start-Up’ second lead who became Hong Du-sik
Few examples of second-lead syndrome are as famous as Kim Seon-ho’s Han Ji-pyeong in ‘Start-Up’.
The sharp-tongued investor was supposed to be part of the love triangle. Instead, Ji-pyeong became one of the drama’s biggest talking points, splitting viewers into passionate camps.
Many fans wanted him to end up with Bae Suzy’s Seo Dal-mi, despite the story ultimately pairing her with Nam Joo-hyuk’s Nam Do-san.
But the disappointment of ‘Start-Up’ became a career turning point.
Just one year later, Kim Seon-ho landed a major leading role in ‘Hometown Cha-Cha-Cha’, starring opposite Shin Min-a as Hong Du-sik, the seemingly perfect handyman with layers of his own.
The series cemented his status as a romantic leading man.
His career later hit a difficult period following a personal controversy in 2021, but he eventually returned to prominent roles. In 2026, he starred opposite Go Youn-jung in Netflix’s ‘Can This Love Be Translated?’ and is set to reunite with Bae Suzy in Disney+’s ‘Portraits of Delusion’.
The journey is particularly striking: the actor many viewers once wished had won the girl eventually became the man getting his own leading romances.
3. Jung Hae-in: From supporting favourite to romance king
Today, Jung Hae-in is widely associated with romantic leading-man roles.
It wasn’t always that way.
He attracted attention in ‘While You Were Sleeping’ (2017) as police officer Han Woo-tak, a character positioned within the drama’s central romantic storyline but ultimately functioning as a second male lead.
The following year changed his trajectory.
In ‘Something in the Rain’ (2018), Jung Hae-in starred opposite Son Ye-jin as Seo Jun-hui, a younger man who falls for his older sister’s best friend.
The chemistry between the pair helped turn the drama into a major romance hit and established Jung Hae-in as a leading actor.
He subsequently took centre stage in projects including ‘One Spring Night,’ ‘D.P.,’ ‘Snowdrop’ and ‘Love Next Door’.
And in 2026, he entered another chapter of his romance-heavy career with Netflix’s ‘Our Sticky Love’, where he stars opposite Ha Young. Netflix describes the series as a romantic comedy involving an ambitious prosecutor who loses her memory and a boxing coach who claims to be her boyfriend.
The former second lead has become one of K-drama’s most dependable romantic stars.
4. Hwang In-youp: The ‘True Beauty’ heartbreak king gets his own love stories
If there is one actor who knows the pain of being the second lead, it is Hwang In-youp.
As Han Seo-jun in ‘True Beauty’, he played the rebellious bad-boy heartthrob who secretly had a softer side.
The problem?
Cha Eun-woo’s Lee Su-ho was the official male lead.
Hwang’s performance nevertheless generated an enormous fan following. His chemistry with Moon Ga-young and the emotional weight of Seo-jun’s unrequited love made him one of the drama’s most memorable characters.
Then came ‘Family by Choice’ (2024).
Hwang In-youp moved into a central romantic role as Kim San-ha, one of three young people raised together as a family before being separated and reunited years later.
Soompi confirmed his role as one of the drama’s central characters, while Tatler identifies the series as his first major romantic leading role.
The transition was significant.
In ‘True Beauty,’ audiences watched Hwang’s character lose the romance.
In ‘Family by Choice,’ he finally got to be at the centre of one.
5. Bae In-hyuk: From campus rival to leading man
Bae In-hyuk made an impression as Gye Seon-woo in ‘My Roommate Is a Gumiho’ (2021).
His character began as a campus playboy but developed into a much more vulnerable figure after falling for Lee Hye-ri’s Lee Dam.
Despite being positioned as the second lead, Bae’s performance gave the character enough depth to stand out alongside the show’s main pairing.
Two years later, he got the opportunity to lead.
In ‘The Story of Park’s Marriage Contract’ (2023), Bae played Kang Tae-ha, a chaebol heir who enters a contract marriage with Lee Se-young’s time-travelling character.
The role helped establish him as a leading man, and he later continued that trajectory in ‘Our Universe’ (2026) alongside Roh Jeong-eui.
The latter series pushed him into another kind of leading role, combining romance, family responsibilities and an unexpected co-parenting situation. South China Morning Post described Bae and Roh as the drama’s leading pair.
6. Park Gyu-young: From supporting roles to Netflix lead
Park Gyu-young took a different route to the top.
She appeared in supporting roles in dramas such as ‘Romance Is a Bonus Book’ and ‘Nokdu Flower’ before taking on a more prominent second-lead role in ‘It’s Okay to Not Be Okay’.
As Nam Ju-ri, she played a psychiatric nurse quietly in love with Kim Soo-hyun’s Moon Gang-tae.
She then became part of Netflix’s global hit ‘Sweet Home’, gaining even wider international exposure.
Her breakthrough as a leading actress arrived with ‘Dali and the Cocky Prince’, followed by the role that truly demonstrated her star power: ‘Celebrity’.
In the Netflix series, Park played Seo A-ri, a social-media influencer whose rise through Korea’s celebrity economy turns increasingly dangerous.
The role transformed her from supporting player into a performer capable of carrying an entire series.
She later appeared in ‘Squid Game’ Seasons 2 and 3, further expanding her international profile.
7. Go Min-si: From the girl fans loved to hate to a leading actress
Sometimes, a breakout doesn’t come from playing the nicest character.
Go Min-si proved exactly that.
In Netflix’s ‘Love Alarm’, she played Park Gul-mi, the selfish and status-conscious cousin of Kim So-hyun’s Kim Jo-jo.
Gul-mi was hardly the character audiences were supposed to adore.
But Go Min-si’s performance made her impossible to ignore.
She followed that with the role of Lee Eun-yu in ‘Sweet Home’, giving her an increasingly visible place in one of Netflix’s major Korean franchises.
Then came ‘Youth of May’.
Go Min-si played Kim Myung-hee, a compassionate nurse opposite Lee Do-hyun. The emotionally devastating drama showed that she could carry a romance as a central heroine rather than simply dominate supporting scenes.
She later went in the opposite direction with Netflix’s ‘The Frog’, playing Yoo Seong-a, an unsettling antagonist.
That versatility became one of her biggest strengths.
South China Morning Post has similarly traced her rise from difficult-to-cast beginnings to international recognition through projects including ‘Sweet Home.’
8. Roh Jeong-eui: From teen supporting roles to leading lady
The youngest name on this list may have one of the most interesting trajectories.
Roh Jeong-eui first gained broader recognition as Hong Shi-a, the rebellious teenage daughter in ‘18 Again’.
She then stepped up to a second-female-lead position in ‘Our Beloved Summer’, playing K-pop idol NJ, who develops feelings for Choi Woo-shik’s character.
But her real leading-lady breakthrough arrived with Netflix’s ‘Hierarchy’.
Roh played Jung Jae-i, the wealthy queen of an elite high school caught in a complicated romantic triangle.
That role established her as a leading actress capable of carrying a much larger share of a drama’s narrative.
She subsequently took leading roles in ‘The Witch’ and ‘Our Universe’, with the latter pairing her with Bae In-hyuk.
Tatler’s own recent profile describes her progression from supporting character to second female lead and eventually to major leading roles.
Why K-drama’s “second lead” can be the beginning—not the end
There is an important lesson hidden inside these career journeys.
A second lead is not necessarily a dead end.
For many actors, it can be the role that gives audiences their first real reason to care.
Kim Seon-ho’s Han Ji-pyeong became bigger than the conventional second-lead archetype.
Hwang In-youp turned Han Seo-jun’s heartbreak into a career-defining performance.
Byeon Woo-seok transformed years of supporting work into a global breakout with ‘Lovely Runner’.
Go Min-si demonstrated that an actress can move from a hated supporting character to a critically noticed heroine—and then convincingly play a villain.
And Jung Hae-in showed how quickly a memorable supporting performance can lead to an entirely different career trajectory.
The pattern is becoming increasingly clear: sometimes the character standing just outside the spotlight is the actor audiences are waiting to see in it.
And once that opportunity arrives, some don’t just step into the spotlight—they take it over.
The bigger K-drama trend
The rise of these actors also reflects a broader change in Korean television.
Streaming platforms have dramatically expanded the global audience for Korean dramas, giving performers more opportunities to move between genres, platforms and character types.
A supporting role in one hit can become a springboard to a starring role in another.
That is particularly visible with Netflix and Disney+, where Korean productions now travel far beyond their original domestic audience.
The result is a new generation of actors who are not being defined by a single archetype.
The former second lead can become the romantic hero.
The supporting actress can become the central anti-heroine.
The lovable rival can become the villain.
And the actor audiences once begged writers to choose can eventually get a drama where the entire story revolves around them.
That may be the real secret behind second-lead syndrome: sometimes viewers aren’t just falling for a character.
They’re discovering the next star before the industry officially calls them one.
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