Three years ago, Seoyoon broke up with her boyfriend of 10 years, Noah. Her past relationship left her traumatized, unable and unwilling to go through such an experience again. But Noah, even after breaking up with her, stills loves her and wants them to get back together. Finding comfort in Seoyoon’s voice, he calls her all the time. Because of a promise she made to him, Seoyoon feels obliged to answer his calls. However, now that she’s in a relationship with Seok-hee, the most popular actor under their company, she starts to wonder if it’s the right thing to do. Seok-hee is head over heels in love with her and wants to get more serious. Tempted to move on from the pain and Noah, Seoyoon starts to consider accepting his affections. But it won’t be an smooth journey for them. Follow their trials and growth in this heartwarming romance.