Liu Bo (Chen Kun), Xu Dong (Qin Hao) and Wang Pingchuan (Yu Entai), who have been good friends since middle school, gradually developed conflicts because of the poor management of the hot pot restaurant transformed from an air-raid shelter they jointly operated. The three brothers were preparing to transfer the store, and in order to sell it at a good price, the three began to expand it on their own. Unexpectedly, they accidentally dug into the vault of the bank next door. Faced with the temptation of money, Liu Bo, who owed gambling debts, was in a dilemma. As luck would have it, a female junior high school classmate Yu Xiaohui (Bai Baihe) happened to be an employee of this bank. The three were ready to ask Yu Xiaohui for help, but they didn't expect that Yu Xiaohui was thinking about a love letter from that year... The broken air-raid shelter linked up the old youth and four old classmates, and a long-planned bank robbery also quietly grew.