Yang Jing, a top mercenary and hunter, finds himself swapped bodies with a fat宅 who dreams of time travel. His martial arts skills are gone, and cultivation is impossible in this world! To make matters worse, the fat宅 is a genius PhD, while he knows nothing. Forced to keep a low profile, Yang Jing tries to blend in... until a part-time dad gig throws his plans into chaos! A sweet and sensible little girl grabs his hand, asking for his help. He vows to do everything for her, even if it's because her mother is beautiful, or because he likes her kind heart and her refusal to give up.