Woo Jin-han

Kim Seung-hwan’s guardian. Arrives with their daughter, tearfully asks about survival odds and her husband’s suffering, decides to stop resuscitation, then breaks down at the bedside.

White-coat colleague with an ID badge. In the cafeteria he goads Woo Jin-han about Han Ju-won’s return and the old murder until Do-yeon stops him; in the flashback intern day he frets over ER assignment and dreads Han Ju-won.

Kim Seung-hwan’s elder daughter, a student about to enter high school. Arrives at the ER with her mother in tears and sobs at the bedside after the death pronouncement.

Hospital department head. After the Yeongdeungpo explosion he departs by helicopter for the scene, orders Han Ju-won as chief to stay and guard the ER with Professors Min and An joining him, teases Han about kicking out interns again, and takes off.

Elderly patient lying in a ward bed with monitor leads attached; Han Ju-won touching those leads triggers Woo Jin-han’s intrusion.

55-year-old man transferred after office chest pain, anterior MI on ECG, and no response to NTG at hospital A. He still has pain and dyspnea, asks staff not to tell his family because of his high-school daughter and tired wife, but Han refuses. He later goes into V-fib requiring CPR.