Yoon Chan-young

Seo Young-joo

Song Yi-heon/Kim Deuk-pal Song Yi-heon: A 19-year-old high school student who suffered from bullying and decided to end his life. He is the illegitimate son of Chairman Bae, owner of one of the largest construction companies. Kim Deuk-pal: A 47-year-old gangster of the Chilsung Gang who dreams of studying and joining high school, as he wasn't able to study due to his poor background. One day, his soul enters the body of Song Yi-heon when he tries to stop the boy from committing suicide. Unable to escape the body of the young student, he finds out that the real Song Yi-heon was severely bullied, which caused him to commit suicide. He decides to punish his bullies and help him to get into university with good grades. During the process, he befriends the school's class president and popular boy, Choi Se-kyung.

Seo Young-min, a livelihood taxi driver who runs a one-of-a-kind business known as "Ghost-Only Taxi"

Joo Dong-myung

Lee Gi-seok

Young Gong Woo-jin

Young Wang Rin, Marquess Sujeong

Young Hoo-ye.

Young Kang Dong-joo

Young Jang-go.

Young Ddang-sae

Young Ri-hwan

Young Hong Joo-won

Han Geu-roo Choi Seung-hoon as child Geu-roo Park Seo-joon as adult Geu-roo

Young Sun-woo