An extremely dangerous patient who has been in the hospital for a long time. Known for being aloof and stranger-repelling, Patient No. 7 once gave Wang Peng killing intent that caused nightmares. However, after Xu Xingyuan became his attending physician, Patient No. 7 became unusually clingy and obedient, proactively getting food and water for Xu Xingyuan like a devoted cat. Wang Peng suspected an ambiguous relationship between Patient No. 7 and Dr. Xu.
