Song Zaixi has been quietly paying protection money for Park Hyun and her mother. It's hard for a girl who loves to laugh to appear on her again. She is strong and brave and willing to give her life for love. She is deeply in love with Park Hyun, and always has been.

Su-yeon Oh is a thoracic surgeon and the illegitimate daughter of Wu Junkui, chairman of Mingyu University Hospital. I was neglected by my biological mother since I was a child, and grew up in the contempt of my half-brother. To make my father happy, study hard.

Introduction of the protagonist's plot in The Doctor Stranger;

JaeHee was arrested for no reason, and Park Hsun was forced to work in the Medical Research Institute, where he did many cruel experiments that violated medical ethics. Park hoon has been looking for the whereabouts of JaeHee. Five years later, Park Xun discovered that Zaixi was actually the object of his clinical experiment. Under the arrangement of Park Zhe, he and Zaixi got the opportunity to go to Budapest. When they fled, they were chased by North Korean government personnel. JaeHee was shot and disappeared in the sea.

After several twists and turns, Park Xun successfully "left the North" and returned to South Korea, and joined Mingyu University Hospital as a doctor because of fate. Park Xun happened to see the figure that looked like Zaixi in the hospital, and pursued the whereabouts of Zaixi persistently. At the same time, Park Hsun, who grew up in North Korea, can stand up to power struggles and political intrigues in the hospital as a stranger.