Top student Yeon Isol suddenly gains the ability to see people's true feelings as hashtags.

But then her first love, Seong Shinwoo, ends up tagged with #Trash_Who_Used_To_Be_My_First_Love?!

The pain of being abandoned without ever knowing the reason comes rushing back, and Isol joins forces with Baek Seol, who hates Shinwoo.

Is it revenge, or lingering feelings?

This time, who will be hurt first?