A Bin (Zu Feng), a policeman who suffers from depression due to his girlfriend's suicide, and his partner Lei Ge (Chen Minghao) met the victim's sister Li Xue (Huang Lu) while investigating a dismemberment case. Li Xue claimed to have dreamed that her brother was killed. During the investigation, A Bin discovered that Li Xue had lost her daughter and suffered from depression. The two felt pity and understanding for each other. At this time, Tingting (Zhang Qianru), a girl wandering in the city, gradually walked into A Bin's (Zu Feng) life and developed an inexplicable bond with him. How should lonely girls and patients suffering from depression face their own hearts and how should they find light in this world...