Love of eternity

A simple American beauty, Lia, flies over to Korea on a scholarship.
Upon getting there, she finds out her boyfriend has been cheating on her.
What happens when her ex boyfriend finds out that a cold-hearted billionaire with no care in the world about others feelings or wellbeing sympathies with her and falls deeply in love with her, she becomes his only reason to breathe.
Whether he's coming back to her to use the Billionaire's love for her as a means of filling his pocket or he has fallen for her once again.
Will she go for her billionaire or her ex boyfriend.