Li Hang and Liu Zhengyuan’s seven-year relationship, which began in college days, ultimately comes to an end under family pressure. Disheartened, Li Hang seeks a new start in Beijing, only to be plagued by a persistent toothache that traps him between painful memories and present realities. An encounter with a dental intern seems to offer a glimmer of hope in Li Hang’s life. Yet light can quickly fade in the concrete urban jungle.