On the night before his wedding, Chen Yang catches his fiancée, Su Ting, betraying him with Zhao Kai, his friend of fifteen years, just as his mother is hospitalized following a sudden heart attack. Under this double blow, old grudges from the older generation and the mystery surrounding their identities surface. Moving from confrontation to joining forces to investigate the truth, the two brothers gradually resolve their grievances, sort out past rights and wrongs, and finally let go of their obsessions to restart their respective lives in the ordinary daily routine.