Internet celebrity chef Yeung Tak-Kei loses his job after he accidentally reveals his boss's scandal, so he seeks shelter with his maternal half-sister Chu Sau-Na to become a private investigator. Under Sau-Na’s unfavorable employment conditions, Tak-Kei has to convince “Golden Tongue” Mak Sei to join them, leaving him no other choice but to keep making gourmet food for a mystery diner.