Three years ago, Seoyoon broke up with her 10-year boyfriend, Noah. The past relationship left her hurt, unable, and unwilling to go through such an experience again. But Noah, even after their breakup, still loves her and wants them to get back together. Finding solace in Seoyoon's voice, he calls her incessantly. Due to her promise to him, Seoyoon feels obligated to answer his calls. However, she is now in a relationship with Seok-hee, the most famous actor in their company, and she begins to wonder if that's the right thing to do. Seok-hee is deeply in love with her and wants to get more serious. Tempted to overcome the pain and Noah, Seoyoon begins to consider accepting his affection. But it won't be a smooth journey for them. Follow their challenges and growth in this warm romantic story.