Lee Sang-jun
BIOGRAPHY
Lee Sang-jun (이상준, born 3 March 1998) is a South Korean actor managed by Double H TNE, with thirteen screen credits going back to 2017. His name is also romanised Lee Sang-joon.
His Boys’ Love credit is Heesu in Class 2 (2반 이희수), a ten-episode Korean series adapted from the manhwa. It ran on Heavenly from 28 March to 26 April 2025 and was made by filmK. He is billed second in the cast as Kim Seung-won, opposite Ahn Ji-ho in the title role.
The rest of the filmography is mainstream Korean television across nine years. He appeared in the anthology Drama Stage in 2017, the film Bully in 2018, and then in 2021 in Blue Birthday, School 2021, the film Love Spoiler and a single episode of Squid Game as a Pink Soldier. Later work includes Cheer Up in 2022, the fifty-episode daily drama Beauty and Mr. Romantic and the fourteen-episode Connection in 2024, and The Legend of Kitchen Soldier in May 2026.
The character names and episode counts fill in the middle of his list. He played Cha Eun-seong across sixteen episodes of Blue Birthday, which began on 23 July 2021, and Lee Jae-hyeok across sixteen episodes of School 2021, which began on 24 November 2021. In Love Spoiler he was Kim Dae-Il. In 2024 he was Park Do-jun in Beauty and Mr. Romantic, Kim U-sung in Connection and a younger Song Ki-baek in a single episode of Frankly Speaking. In The Legend of Kitchen Soldier, which began on 11 May 2026, he plays Cha Seung-woo.
Heesu in Class 2 was directed by Park Kyung-min and made by Changin’ Pictures with filmK, at about forty-five minutes an episode, and it reached international viewers through Viki. It is adapted from Lily Suzu’s webtoon, published by Lezhin Comics. Four Hands, Two Sonatas was written by Shin Yi-won and directed by Park Hyeon-seok, with Song Kang, Lee Jun-young and Jang Gyu-ri in the three leading roles.
In 2026 he plays Yoon Han-rim in Four Hands, Two Sonatas (포핸즈), the twelve-episode tvN music drama made by Studio Dragon with Namoo Actors, about two young pianists from different backgrounds who meet at an elite music high school.
Lee Sang-jun is billed second in the 2025 Korean Boys’ Love series Heesu in Class 2, opposite Ahn Ji-ho.
That credit sits inside a career in mainstream Korean television that began in 2017. In 2021 alone he had four credits, from School 2021 to a single episode of Squid Game, and in 2024 he was in a fifty-episode daily drama.
Four Hands, Two Sonatas began on tvN on 29 August 2026 and releases two episodes each weekend, one on Saturday and one on Sunday, across six weekends.
The shape of the credits changes over the years. The early ones include brief appearances, an episode of Drama Stage in 2017 and a single episode of Squid Game in 2021. The most recent three are full seasons: Heesu in Class 2 at ten episodes in 2025, then The Legend of Kitchen Soldier in May 2026 and Four Hands, Two Sonatas in August 2026, both at twelve. His 2025 list carries that single BL series, and 2026 brings two long runs only three months apart.
In my view the most useful way to read his list is by screen time. One episode of Drama Stage in 2017 became sixteen episodes at a time in 2021 and fifty episodes in 2024, a steady widening of the parts he is given. What stayed with me is that his only Boys’ Love credit is also the one where he is billed second. If you want to see him before the tvN series, I would start with the ten episodes of Heesu in Class 2.
PROFILE DETAILS
- Native Name
- 이상준
- Real Name
- Lee Sang-jun
- Pronouns
- he/him
- Born
- (Age 28)
- Gender
- Male
- Western Zodiac
- Pisces ♓
- Chinese Zodiac
- Tiger 🐅
- Profession
- Nationality
- Debut
- 2017 · Drama Stage (2017) as Kim Dae-il
- Agency / Label
- Double H TNE
- Years Active
- 2017-present
- Languages
- Korean
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