Sheng Lan, a female worker at a watch strap factory in Dongguan, is introverted and keeps to herself. Her daily work involves mechanically and repetitively assembling watch straps on an assembly line. Sheng Lan despises this job and environment, and her secret crush on Xiao Shan becomes the only passion in her utterly mundane life. However, Xiao Shan suddenly dies, and in her despair, she unintentionally summons Xiao Shan's ghost, which drags her life into an even deeper mire.