From Pocket Comics:
Twenty-one year old Yuna is tired of having guys hit on her all the time. As popular as she is, she's been single her whole life. Just when she decides to make herself a boyfriend to fend off guys, she meets a handsome guy who looks good enough to be her boyfriend. But wait, the guy is actually a girl! In fact, rumor says that Min is a lesbian. Nonetheless, the two decide to pretend to be in a romantic relationship.

Original Webtoon
Official English Translation