I'll Give You the Most Rotten One

Ten years of relationship go down the drain when Haeru discovers that her loving boyfriend, Se-o, spent the night with another woman. What begins as a series of small misunderstandings snowballs into something much bigger as the college sweethearts wade through love, temptation, and workplace drama. Well, what better way to get back at her cheating boyfriend than to take the most rotten revenge ever?

(Source: WEBTOON)