He is a paramedic on an ambulance. He is young, handsome, and his father is a wealthy chief physician. He could have chosen any path in life, but after studying for two years in medical school, he dropped out due to a failed romance and went to Hawaii. He also abandoned a smooth life and education. After returning, he became an emergency medical technician on an ambulance. His ex-girlfriend has already become an intern doctor and now has a boyfriend, who is also an intern doctor and one of his father's students. His two older brothers are both top students. His father always looked down on him as being irresponsible and hoped he would finish his medical courses and take over the family business as a doctor. On the last day before his credits expired, his father forced him to send in his medical school application by offering to pay off his gambling debts. His colleague is black and divorced because of the daily struggle to support his family. On his son's birthday, he excitedly brought a large gorilla plush toy that he thought his son would like, only to find out that he didn't even know his son's preferences and what he really wanted. His son even rejected his gift. He is somewhat superstitious but indeed very good. They talk about everything, and he even pretends to be his ex-girlfriend to help him practice how to converse with her. Every day, they face the test of life and death, encountering all kinds of people and situations: drug addicts, obese individuals, children and coaches, pregnant women in labor, crazy rich men, angry crowds, the desolation of fire scenes, the friendship between colleagues and friends, the intimacy between lovers, the compassion for children, and the persistence towards patients.