Zhang Yi and Zhang Xin are a happily married successful couple. Zhang Yi works as an architect while Zhang Xin is a stay-at-home father, taking care of their daughter. One day while on their vacation by the beach, Zhang Yi seems an unusual message on her husband's phone which leads her to suspict that her husband is cheating on her. She becomes consumed with the idea to catch him out. (Source: autumn carrot at kisskh)