Seo Kang Jun has been a part of the K-drama industry for over a decade. He debuted in 2012 as a member of 5urprise, the first group of actors created in South Korea, and has since earned a place as one of the most respected performers of his generation. In 2025, he won the Daesang (Grand Prize) for his role in Undercover High School, a recognition that confirms his growth as an actor.
One of his greatest talents is his ability to convey vulnerability and longing naturally, something he has demonstrated across various genres, from historical drama to romantic science fiction. If you want to delve into his filmography, these are six Seo Kang Jun K-dramas worth adding to your watchlist.
Six Essential Seo Kang Jun K-Dramas
1. Hwajung
Hwajung stars Cha Seung Won as Prince Gwanghae, the son of a concubine, and chronicles the rise and fall of Princess Jeongmyeong, played by Lee Yeon Hee. Seo Kang Jun plays Hong Joo Won, the son of a Joseon dynasty family, who falls in love with the princess and faces betrayals while trying to correct the problems of the society in which he lives.
This was one of Seo Kang Jun's first major roles, for which he even received an award. This production highlights how natural he is in the role of a nobleman, especially thanks to his signature gaze. His character is a witty genius who is not afraid to stand up for what he believes is right, combining charisma, intelligence, and swordsmanship to protect those who cannot defend themselves.
2. Cheese in the Trap
Based on the hit webtoon by Soonkki, Cheese in the Trap follows a group of college students caught in a love triangle. Kim Go Eun plays Hong Seol, Park Hae Jin plays Yoo Jung, and Seo Kang Jun plays Baek In Ho. Yoo Jung is the first to confess his feelings to Hong Seol, and she agrees to start a relationship without thinking too much about it. Meanwhile, Seol grows closer to In Ho, Jung's sworn enemy, which places her in the middle of a stressful situation.
Many fans of Cheese in the Trap remember the intense second-lead syndrome generated by the character of Baek In Ho. This role allowed Seo Kang Jun to show charm, sincerity, and vulnerability, especially in the way In Ho loves Hong Seol. His chemistry with Kim Go Eun was also one of the series' major draws. Furthermore, the actor clearly conveys In Ho's evolution from a rebellious boy to someone who truly seeks to build a better life.
3. Are You Human Too?
Nam Shin (Seo Kang Jun) is the son of a wealthy family who falls into a coma after an accident. His mother then creates a robot identical to him, which she calls Nam Shin III, to take his place while he remains hospitalized. With Kang So Bong (Gong Seung Yeon) as his bodyguard, the robot slowly learns human manners.
This romance and sci-fi drama is full of unexpected twists, but one of its greatest attractions is Seo Kang Jun's ability to convey emotions even while playing a robot. By taking on the dual role of Nam Shin and Nam Shin III, the actor demonstrates his versatility, making both characters feel completely distinct: one cold and arrogant, and the other kind and innocent.
4. Watcher
Do Chi Kwang (Han Suk Kyu), Kim Young Koon (Seo Kang Jun), and Han Tae Joo (Kim Hyun Joo) have all lived through great personal tragedies. The three are part of an investigative team tasked with exposing corruption within the police force.
In Watcher, Seo Kang Jun shows a tougher and more charismatic side, an interesting change of pace compared to other roles. His character, Young Koon, has a much darker past than his previous roles, and the actor manages to convey that complexity as the mystery behind his traumatic childhood is revealed.
5. I’ll Go to You When the Weather Is Nice
When Mok Hae Won (Park Min Young) decides to leave Seoul to move temporarily to the countryside with her aunt, she reunites with her old high school friend, Im Eun Seob (Seo Kang Jun). Eun Seob has been in love with Hae Won since he first met her and is happy to learn that she will be staying there for a while. The two rekindle their friendship, and little by little, their feelings begin to transform into love.
I'll Go to You When the Weather Is Nice is the kind of comforting drama that many viewers didn't know they needed. Seo Kang Jun does an exceptional job showing Eun Seob's quiet and unwavering love for Hae Won, conveying feelings he has kept for years through subtle gestures.
6. Undercover High School
Jung Hae Sung (Seo Kang Jun) is a star NIS agent who is demoted after a failed operation. To find missing gold bars belonging to King Gojong, he goes undercover as a student at a prestigious high school. There, he meets teacher Oh Soo Ah (Jin Ki Joo), who begins to notice similarities between Hae Sung and her first love, a person who left a deep wound in her heart.
Seo Kang Jun shines especially in this production thanks to his character's duality: on one hand, a tough and highly skilled NIS agent, and on the other, an undercover high school student. The role allows him to combine action, comedy, and more emotional moments into a single character, for which he ultimately won the Daesang in 2025.
Frequently Asked Questions about Seo Kang Jun’s K-Dramas
For which role did Seo Kang Jun win the Daesang in 2025?
Seo Kang Jun won the Daesang (Grand Prize) in 2025 for his performance in Undercover High School, where he plays an NIS agent undercover as a student.
What was one of Seo Kang Jun’s first major roles?
Hwajung was one of his first prominent roles, in which he played Hong Joo Won and received an award for his performance.
In which drama does Seo Kang Jun play a robot?
In Are You Human Too?, Seo Kang Jun plays a dual role: the human Nam Shin and the robot Nam Shin III, created to replace him after an accident.
What type of character does Seo Kang Jun play in Watcher?
In Watcher, Seo Kang Jun plays Kim Young Koon, an investigator with a dark past who is part of a team dedicated to exposing police corruption.
What is I’ll Go to You When the Weather Is Nice about?
The series follows Mok Hae Won, who moves temporarily to the countryside and reunites with her high school friend Im Eun Seob, played by Seo Kang Jun, with whom she develops a romantic relationship.
