Yeon isol, the top student in her school, suddenly begins to see people’s true feelings as “hashtags.” But… above her first love, Seong Shin-woo, a tag appears: #My_first_love_who_turned_out_to_be_trash?!

The old wounds of abandonment—wounds she never understood—resurface, pushing Ye-seol to team up with Baek Sol, who also hates Shin-woo. Is it revenge? Or lingering affection that refuses to fade? And who will end up hurt this time?