6 Seo Kang Jun K-Dramas Worth Binging: From Royal Sword Fights to a Robot Heartthrob and a Secret Agent Student

Some actors are known for one big role. Seo Kang Jun is known for a whole spread of them. Since debuting in 2012 as part of the first-ever actor group 5urprise, he has built a reputation for portraying vulnerability and longing with effortless charm, and he won the Daesang (Grand Prize) for Undercover High School in 2025. If you’re new to his work, here are six dramas to add to your list.

Seo Kang Jun to the Six Picks

1. Hwajung

Set in the Joseon Dynasty, this historical drama follows the rise and fall of Princess Jeongmyeong (Lee Yeon Hee) alongside Prince Gwanghae, played by Cha Seung Won. Seo Kang Jun plays Hong Joo Won, who falls in love with the princess, faces betrayal, and tries to fix the problems of his society. It was one of his first major roles, and he even won an award for it. He fits the noble look naturally, and his witty, principled character uses charm, intelligence, and a sword to protect people who can’t protect themselves.

2. Cheese in the Trap

Based on the popular webtoon by Soonkki, this college drama tangles Hong Seol (Kim Go Eun) in a love triangle between Yoo Jung (Park Hae Jin) and Baek In Ho, Seo Kang Jun’s character. In Ho is Jung’s sworn enemy and grows close to Seol, leaving her caught in the middle. The role gave viewers a serious case of second-lead syndrome. Seo Kang Jun brings sincerity and vulnerability to In Ho, showing his growth from rebellious bad boy to someone who genuinely wants to build a happier life.

3. Are You Human Too?

In this sci-fi romance, wealthy heir Nam Shin falls into a coma after an accident, and his mother creates a robot lookalike, Nam Shin III. Guarded by Kang So Bong (Gong Seung Yeon), the robot learns human mannerisms and takes his place. Seo Kang Jun plays both parts, and the contrast is the fun. His human Nam Shin is cold and arrogant, while the robot is kind and innocent. The drama is full of cliffhangers and showcases his range.

4. Watcher

Here Seo Kang Jun trades softness for a rougher edge. Kim Young Koon is one of three people touched by tragedy (alongside Do Chi Kwang, played by Han Suk Kyu, and Han Tae Joo, played by Kim Hyun Joo) who join an investigation team to expose police corruption. His character carries a darker past than many of his earlier roles, and the slow reveal of his traumatic childhood keeps you hooked. It’s a strong pick for crime and mystery fans.

5. I’ll Go to You When the Weather Is Nice

If you need comfort viewing, this is it. Mok Hae Won (Park Min Young) leaves Seoul for the countryside and reunites with old high school friend Im Eun Seob, who has loved her for years. The two rebuild their friendship and slowly fall in love. Seo Kang Jun portrays that quiet, steady love with soft glances and subtle expressions, making you believe he has carried these feelings for years.

6. Undercover High School

His latest big hit brought the Daesang. Jung Hae Sung is an ace NIS agent, demoted after a failed operation, who goes undercover as a student at a prestigious high school to find King Gojong’s missing gold bars. He meets homeroom teacher Oh Soo Ah (Jin Ki Joo), who sees echoes of her first love in him. Seo Kang Jun balances action, comedy, and tenderness, switching easily between a hardened agent and a teenager in disguise.

Where to Start?

Want romance? Go with I’ll Go to You When the Weather Is Nice. Want something bolder? Try Are You Human Too? or Undercover High School. For more, read about the actor on Wikipedia, and browse our K-drama updates and entertainment news on Technosports.

FAQs