Dong discovers a hidden truth about the past of his father, mother, and Aunt Tum.

Dong confronts his mother about her efforts to make up for her past, resulting in an agreement that Dong will make more decisions on his own moving forward, starting with playing badminton singles.  Tum takes Gym to a recreation facility for kids with autism where he finds a way to incorporate his passion for badminton.

When Dong breaks his promise to visit home on Sundays, Gym sets out to find his old partner.