Characters played by Tae-Hyun Cha
Kim Soo-ho
Characters played by Song Hye-Kyo
Bae So-eun
Characters played by Chang-ui Song
Park Jong-gu
Characters played by Jung-hee Moon
Soon-im
Soon-im's daughter
Characters played by Sang-Jeon Woo
No Seonsaengnim
Characters played by Kim Yoon-seok
Biology Teacher
Characters played by Kim Hae-sook
Soo-ho's mother
Characters played by Ju-hyeon Ok
So-eun's school friend