The reformed Zhao Hongbing returned to his hometown, and while running a "Xinxingyuan" restaurant with his comrade-in-arms Xiao Beijing, he was looking for Xiaolong, the son of his old friend. In the process of looking for Xiaolong, Zhao Hongbing met the barber Xiaojing due to a misunderstanding, and gradually became attached to each other in the process. Zhao Hongbing provoked Dahu because of taking in and taking care of Xiaolong, and Xiaolong's naughty also made people around him criticize Zhao Hongbing's behavior. All kinds of troubles also followed, overwhelming Zhao Hongbing, and the big tiger was also eyeing the "Xinxingyuan" hotel in the dark

The major case squad within the public security organization tackles a series of perplexing cases, led by forensic expert Liao Yan and criminal psychology specialist Liang Maiqi. Both are young professionals returning from abroad, leveraging their expertise to solve unusual cases. Through close collaboration with their teammates, they navigate dangerous situations, using their intelligence and bravery to resolve crises and complete missions. Meanwhile, other young officers in the squad also develop friendships and grow personally through their involvement in solving these intriguing mysteries.

Zhou Fang, the young master of Tongming Hall on the Shanghai Bund, fights Longde from Chamber of Commerce to avenge the murder of his father.