Wu Changmin (Choi Jin Hyuk), who was born in a family of doctors and was romantic but carefree, had a glorious history, but he also took a long detour because of a failed marriage. At the age of 30, he and his good friend Lin Rongkui (Yun Zhongxun) entered the excellent WSUH hospital and started a new journey as an intern. On the first day of internship, he and Rongkui, Park Sang Hyuk (Lin Xiancheng), who was controlled by his wife, Li Yingji (Qian Minxi), and Han Yalin (Clara), were assigned to the emergency room team leader Guo Tianxiu (Lee Pilmo). What Changmin didn't expect was that his ex-wife Wu Zhenxi (Song Jixiao) was drunk and sent to the emergency room the day before, and was actually assigned to the same group as an intern. The old relationship has not been broken, and the new journey of life has begun. What kind of story will happen between these men and women in white who are full of ideas for the future?