Seol-jong Kim is a first-year resident in the Department of Internal Medicine at Sain University Hospital. She has the looks of a celebrity but the personality of a shameless troublemaker. Kyung-jin Park, known as the “madman of internal medicine,” is the department’s chief resident and Seol-jong’s fiercest rival. He’s cool-headed and deeply committed to his work. Though Seol-jong constantly gets in his way, he finds himself unexpectedly drawn to her. Jun-woo Park, the chief resident of the Department of Cosmetic Surgery, is the lucky man who captures Seol-jong’s heart with his charm and confidence. Set within the bustling halls of Sain University Hospital, this webtoon tells a tangled love story — where rivalry and attraction collide, and a love triangle unfolds in the most unexpected of ways.