Female teacher Ye Ning takes her perfect boyfriend Ai Jie to the old family home deep in the mountains to meet her parents. Ai Jie is gentle, tactless-free, and flawless, yet reveals flaws in front of her father Ye Daoming, a retired undercover police detective. A fake smile, a dual-system phone, abnormal mate-selection motives, and fake campus memories—four major suspicions make the Ye family conclude that this perfect boyfriend is definitely no good person!!!