Why is my ex-boyfriend here!

When Yeo-ju went on a blind date, her ex-boyfriend Park Woo-jin was there. The reason they broke up was because Woo-jin cheated on her. In fact, Yeo-ju misunderstood, and when Woo-jin told her it wasn't true, she didn't believe him, so they broke up. However, they both had feelings for each other, so they started over. Originally, Yeo-ju had been more interested in him than Woo-jin, but now it's Woo-jin who's making the appeal to Yeo-ju.