Characters played by Tae-woong Eom
Seung-min - Present
Characters played by Ga-in Han
Present Seo-Yeon
Characters played by Lee Jehoon
Seung-min - Past
Characters played by Bae Suzy
Past Seo-Yeon
Characters played by Jun-hee Ko
Eun-chae
Characters played by Jo Jung-Suk
Nabddeuckyi
Characters played by Yoo Yeon-Seok
Jae-wook
Characters played by Dong Joo Kim
Seung-Min's mother
Characters played by Dong Joo Kim
Seung-Min's Mother
Characters played by Seung-Ho Lee
Seo-yeon's father
Characters played by Eui-sung Kim
Professor Kang
Characters played by Su-Young Park
Director Goo
Characters played by Hyeon-cheol Jo
Dong-goo
Characters played by Ye-jin Sin
Sing-soong-i