Yeon Isol, the top student in school, gains the ability to see people’s true feelings as “hashtags.” But her first love, Seong Sinwoo, has tagged her as “#first_love_that_was_trash”?! The wound from being abandoned without knowing why resurfaces, and Isol teams up with Baekseol, who hates Sinwoo. Is it revenge? Or lingering feelings? Who will get hurt first this time?