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Wu Yu, a math prodigy, and Tan Jiao, a mystery novelist, fall in love on a cruise but both suffer memory loss afterward. Wu Yu forgets the days following the trip, while Tan Jiao loses nearly a year and a half. After the tragic death of his sister, Wu Yu abandons his promising future to work as a mechanic in search of the truth. In his quest for justice, he crosses paths with Tan Jiao again....
Sining brings his American boyfriend, Patrick, back to China when he goes to visit his family. Everyone's attitude towards Patrick changes once Sining inadvertently comes out, except for his 7-year-old nephew’s, Naonao....