Kang Hee Jae and Ban Yoo Jin have been dating for six months; Yoo Jin announces that she's going on a trip alone with her male friend, Sang Ah; Hee Jae is baffled, so Yoo Jin assures him that she and him are just friends.

Hee Jae worries that he and Yoo Jin will suffer from an A-B relationship. Senior Bong advises him not to take the difficult path.

The deeper their relationship goes, the more Hee Jae's desire for her grows; Yoo Jin asks him outright why he wants to have sex with her, and Hee Jae replies that it's because he loves her; the two begin to prepare for their first experience.

Yoojin and Heejae's anniversary approaches, and the two meet up. However, Yoojin becomes upset when Heejae does not spend money on their date.

Nam Hyun lives like a private assistant running Ko Yoon's library errands, and he wants to be seen by her as a man; Nam Hyun seeks Hee Jae for help in confessing his feelings to her; Hee Jae proudly shares the successful know-how to Nam Hyun.