Although her family opposed and she lacked connections, Shin Chae-rin persevered and landed an internship at Migang Hospital with the goal of pursuing a career in medicine. While working there, she crosses paths with Baek Kangwoo, a successful doctor who is wrestling with the idea of giving up his training. Amidst the frenzy of the emergency room, their romantic relationship begins to bloom. Chae-rin confronts the obstacles of her work and her emotions for Kangwoo.