One day, the name 'Jeong Myeong Ok' was engraved on Do Eun Seol's body. Who are you? In the increasingly busy daily life at the hospital, a name appeared on the back of Eun Seol's hand. To remove the name, she had to undergo surgery by the plastic surgery professor, Chae Yeon, which plunged Eun Seol into an endless abyss of despair. The reason for this was her relationship with Chae Yeon, who had been like an enemy for 12 years! Nevertheless, Eun Seol sought out Chae Yeon for the surgery, but as expected, she was rejected. Eventually, Eun Seol searches for her soul mate, Myeong Ok, and has a serious meeting with the premise of a future together. Meanwhile, strangely, Chae Yeon begins to treat Eun Seol differently than before…. Myeong Ok and Chae Yeon, reason and emotion, in between. Where will Eun Seol's heart, which has lost its signpost, ultimately lead?