Uninvited guest
Park Hye Sung and Jin Seung Ju decide to invite a man to join them out of boredom. However, that man turned out to be In Wu, Seung Ju's college classmate.
In Wu has been in love with Seung Ju forever, and Hye Sung becomes jealous of In Wu and Seung Ju's relationship.
However, between the two men Seung Ju will have a different turning point than sex.