In a flashback to 2006, high schooler Joonyoung learns why his mom had to raise him alone. No Eul, also in high school, witnesses a terrible accident.
Kim Woo-bin
Shin Joon-young
Bae Suzy
No-eul
Lim Ju-hwan
Choi Ji-tae
Im Joo-eun
Yoon Jeong-eun
Jin Kyung
Shin Young-ok
Choi Moo-seong
Jang Jeong-shik
Jang Hui-ryeong
Jang Man-ok
Kim Min-young
Go Na-ri
Kim Jae-hwa
Kim Bong-sook
Yu Oh-seong
Choi Hyeon-joon
Jung Sun-kyung
Lee Eun-soo
Ryu Won
Choi Ha-roo
Hwang Jeong-min
Jang Jeong-ja
Lee Seo-won
No-jik
