Jiu Wenlong (Ekin Cheng) was once a famous man in the underworld, but he was betrayed and arrested in Thailand. Many years later, he returned to Hong Kong and worked as a waiter in the "Kowloon Ice House", intending to disappear from the underworld. Unexpectedly, a 6-year-old boy called him dad. It turned out that this boy named Zhang Zhaolong was the son born to his girlfriend Helen (Mo Wenwei) after he went to Thailand. For the safety of his girlfriend, Wenlong left without saying goodbye. The appearance of Zhaolong made Wenlong's life turbulent again. His temperament attracted his son's class teacher Amon (Li Caihua). Wenlong's identity was still discovered by the underworld, and they hoped that he could regain his glory. The Wenlong that Helen saw again was no longer glorious. She actively paved the way for Wenlong's comeback, but Wenlong didn't want to ask about the underworld anymore...