Due to her first love, who was so beautiful that she fell in love at first sight, Sunwoo has lived as an unwilling pure-hearted girl for 16 years. Leaving behind her stagnant love life, she now works as the head trainer at a training center in Gangnam, living a life focused solely on work. They say it's better not to know about your first love, but her first love became a famous actor, making it impossible to forget. Four years have passed since she disappeared from the public eye due to a loud scandal. Just as she thought she could live without seeing him, a dual feeling of curiosity about whether he was doing well and a desire to not see him anymore coexisted within her. Then, a twist of fate occurred. The chance encounter with Jung Ain, the person she wished would shine from afar. "Have you been well?" She couldn't make the usual small talk. She wanted to keep her distance because of the past. Until she learned the true feelings of Jung Ain, who had been the object of her lonely unrequited love, and who she thought would always be that way...