When Ning An was young, his mother left and his father brought back an aunt and a little girl. Changes in his family made him depressed, and his new sister repeatedly provoked his relationship with others, leaving him alone in the kindergarten. Until one day, a boy with a bright personality broke into his dark world...
Purpose: When youth meet and redeem each other, they go through misunderstandings, separation and reunion, but fall in love but fail to fate, leaving behind the regret that their lives will never be perfect.