Rookie undercover agent Zhou Chuchu accidentally swaps bodies with mafia boss Han Jiuting. She is forced to play the crime lord in his body, while he secretly works undercover in hers. From clashing and setting each other up to joining forces on the case, they uncover a drug-trafficking conspiracy and the truth behind an old family grudge, while stumbling into a hilarious, high-sugar romance built on danger, mistaken identity, and reluctant protection.