Kim Dahyun, an office employee by day and rental girlfriend by night, is hired to pretend to be the blind date of a business tycoon. What she didn't expect was to find her company's CEO, Minatozaki Sana, on the other end of the table expecting a meet-up with the woman she plans to marry.   

Dahyun has finally joined the school's baseball team but many obstacles stand in her way towards becoming the star player like her brother. And then there's Sana, the girl on the team who keeps sending her mixed signals, smirks, weird texts and a whole lot of confusion. Dahyun figured she might as well be the one behind the vandalism of team's uniforms...or the same person who stole her first kiss seven years ago.