Characters played by Si-wan Yim
Jang Geu-rae
Characters played by Lee Sung-min
Oh Sang-shik
Characters played by Kang So-ra
Ahn Young-yi
Characters played by Kang Ha-Neul
Jang Baek-gi
Characters played by Dae-Myung Kim
Kim Dong-shik
Characters played by Eun-Jeong Sin
Sun Ji-young
Characters played by Byoung-Sook Sung
Geu-rae's Mother
Characters played by Myung-Ryul Nam
Geu-rae's baduk teacher
Characters played by Park Hae-joon
Chun Kwan-woong
Characters played by Yo-Han Byun
Han Seok-ryul
Characters played by Park Ha-Jun
Jang Baek Ki (young)
Characters played by Seung-hui Hong
Hong Seung-hwi
Characters played by Son Jong-hak
Ma Bok Ryul
Characters played by Hae-Kyun Jung
Factory worker
Characters played by Joon-hee Song
Oh Joon Woo (Mr. Oh's 3rd son)