Old Zhou is the most inconspicuous retired gatekeeper in Jiangcheng's Yunding Residential Community. Every day, carrying a thermos and wearing an old uniform, he is treated like good-for-nothing trash by property owners and rich second-generation heirs. Until gang prince Zhao Tianqi storms into the community with men to bully his only granddaughter, Zhou Xiaoman. Everyone thinks Old Zhou can only kneel and beg for mercy, but unexpectedly, with a single punch he drops Zhao Tianqi to his knees, uncovering his own true identity sealed away for twenty years.