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.
Jeong-woo questions if he was Ha-neul's first love after their trip. She then goes on a blind date, prompting uncertainty. Ha-neul interviews for a distant job.
Ha-neul feels jealous when she runs into Jeong-woo's old classmate. Despite this, she gives Jeong-woo emotional support when he needs it, allowing him to open up.
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.