Summary:

Ha Yoon-seo learned that Seo Joo-won, her lover for three years, is the youngest son of a rich family. Ha Yoon-seo receives money in exchange for breaking up with Joo-won. And although she did all things to make him break up with her, Joo-won didn't stop pursuing her and still tried to change Yoon Seo's mind...

Notices:

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This manhwa is created by the same artist and author of IT IS MY FIRST LOVE series under Daewon C.I. production. 
Link: https://mangadex.org/title/49284/it-is-my-first-love