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.
Eun-seo struggles repeatedly to find her own place. Her father Jin-cheol lives alone in a house where his family has left. Eun-seo unexpectedly returns her childhood home to live with her father. There, she faces traces of her family she had forgotten.
Jaegi, who has lived the life of a disabled person due to a traffic accident, is judged as Level 5 at the first grade screening. Jaegi strives to become a severely disabled person, but the situation is getting more difficult.
