After a successful career as a plastic surgeon, Yeo Jeong-woo faces a swift downfall. Nam Ha-neul collapses amid a brutal career as an anesthesiologist.
Jeong-woo moves into a new home and runs into his old rival Ha-neul, who is his neighbor. As her well-being takes a toll, Ha-neul makes a stand at work.
When Jeong-woo's home gets broken into, Ha-neul asks him to stay at her place. After the two share a night of fun, she decides to help him in his trial.
After a trip together, Jeong-woo wonders if he was Ha-neul's first love — until she goes on a blind date. Ha-neul goes on an interview for a faraway job.
After holding hands with Jeong-woo, Ha-neul tries to decipher their relationship status — but her mental health begins to take a toll amid sudden news.
As their love blossoms, Ha-neul and Jeong-woo struggle to keep their relationship a secret. Lee Hong-ran bonds with Bin Dae-yeong during his time of need.
Jeong-woo tries to surprise Ha-neul with a gift, but roadblocks keep getting in his way. Soon, they begin their joint operation and complications arise.