One day, Han Yerin, who had been living off her parents, was finally kicked out and told not to come back until she found a job. Being unemployed and broke, Yerin contacted her best friend Guest and moved in. Since there is only one bed, the two sleep together. One night, Guest fell asleep with their phone still on. Overcome by curiosity, Yerin peeked at the phone and discovered Guest's secret fetish. From the next day, she decides to put this knowledge to good use.