On a Christmas Eve, a lifeless body of teenage boy is found. The victim's revenge-driven twin brother checks himself into a juvie to hunt down the suspects.
Joo Il-woo / Joo Wol-woo
Cho Soon-wu
Son Hwan
Moon Ja-hoon
Han Hee-sang
Choi Noo-ri
Baek Young-jun
Ja-hoon's Mother
Lawyer
Yong-cheol
Task Leader
Joo Il-woo / Joo Wol-woo
Cho Soon-wu
Son Hwan
Moon Ja-hoon
Han Hee-sang
Choi Noo-ri
Baek Young-jun
Ja-hoon's Mother
Lawyer
Yong-cheol
Task Leader
