"Bright as Sadness" tells the story of Mu Mu and A Yao who decided to sell alcohol in a nightclub after graduating from university. Mu Mu is obsessed with the inexplicable relationship between her and her third brother, who are 20 years apart, but Ayao becomes Brother Hu's lover. After several incidents, Mu Mu, who is in a trance, makes a shocking move to end such a chaotic life. When Mu Mu finally faced life again, she met her childhood best friend Liu Bai. During the conversation, Mu Mu's thoughts echoed back to that beautiful period in her childhood.
