Episode 4 S01 E04

Lee Sin-young (as Park Chan-Hong) Oh Hee-jun (as Oh Kyung-Pyo) Jang Hye-jin (as Jo Pyeong-Sub) Kim Do-wan (as Kwak Sang-Pil) Kim In-kwon (as Woo Tae-Jung) Kim So-ra (as Choi Jung-Won) Kim Won-hae (as Park Choong-Jae) Shin Seung-ho (as Heo Don-Hyeok) Min Do-hee (as Choi Mi-Ra) Cho Yi-hyun (as Shin Seo-Jung) Lee Jung-hyun (as Kim Dae-Yong) Kim So-hye (as Eom Se-Yoon) Baek Ji-won (as Oh Jung-Hee) Yoo Yeo-Woon (as An Sung-Do)

high school based on comic school school life based on webcomic or webtoon