单身母亲叶湘（闫妮 饰）是一名医院的保洁工，带着患有孤独症的儿子罐头（彭昱畅 饰）在杂物间生活。医生米立、领导赵科长、罐头好友红毛、罐头心动女孩翠翠等形形色色的人物闯入他们的生活，与他们产生各种情感连接。这些或温情或悲伤的经历，影响着罐头的成长与叶湘的内心世界，也为他们的母子关系带来起伏。历经千帆的叶湘最终决定放开紧握罐头二十年的手，独自奔向更广阔的天空……

Single mother Ye Xiang (played by Yan Ni) is a hospital cleaner who lives in the miscellaneous room with her autistic son Can (played by Peng Yuchang). Various characters such as Doctor Mili, Leader Zhao, Canned Friend Hongmao, and Canned Heartbeat Girl Cuicui have entered their lives and formed various emotional connections with them. These experiences, whether warm or sad, affect the growth of canned food and Ye Xiang's inner world, as well as bring ups and downs to their mother son relationship. After experiencing a thousand sails, Ye Xiang finally decided to let go of his grip on canned food for twenty years and run alone towards a broader sky