Choi Do-yoon

A job seeking dreamer Yong-jun works part-time at his parents' lunch box house. Yeo-reum lives only to support for hearing-impaired swimmer sister. One day, Yong-jun meets Yeo-reum while delivering lunch boxes and falls in love at the first sight. Yeo-reum slowly opens her heart to warm-hearted Yong-jun.

Nine-year-old Dojin often spends time alone at home. One day he heads to the backyard to make an anthill and witnesses a murder. He brings home the bloodied brick used as murder weapon.