Lee Min-h0 as Lee Yoon-sung/Poochai
Chae Sang-woo as young Yoon-sung/Poochai
Park Min-young as Kim Na-na
Lee Joon-hyuk as Kim Young-joo
Kim Sang-joong as Lee Jin-pyo
Kim Sang-h0 as Bae Man-duk/Bae Shik-joong
Hwang Sun-hee as Jin Sae-hee
Goo Ha-ra as Choi Da-hye
Chun H0-jin as Choi Eung-chan