I-Sol Yeon, the school’s top student and biggest outcast, gains the ability to see people’s true feelings about her through the Hashtag Lens, which she acquires after making the ten‑quintillionth wish. Through the lens, she discovers that Shin-U Seong, her former middle‑school best friend she had a painful fallout with, has tagged her as “#my_first_love_and_trash.” Can I-Sol mend their broken relationship and overcome the pain of being betrayed by her first love?