Eun-won has been cohabitating with her secret infatuation, Woo-seok, for a year. In reality, he isn’t truly an older "brother" but rather an older man... Nonetheless, to be near him, Eun-won has disguised herself as a boy and taken on the role of his roommate. She imagined a college experience filled with exhilarating and romantic moments, but everything shifted after a club party when a tipsy Woo-seok ended up spending the night with her. Now, with Woo-seok behaving as if he has no recollection of the events, Eun-won is left feeling bewildered and torn. Ultimately, Eun-won resolves to share another night with the inebriated Woo-seok... "Hyung... no, oppa—do you want to sleep with me?"