In the Book of Changes, Yin and Yang were classified as Dao. Similarly, humans were also separated into Yin and Yang; Yang meant the human body, while Yin meant the soul.

When the human body was ill, it would be in the form of a flu and fever, the Yang Illnesses; If the soul was sick, then it would be in the form of mental illnesses such as insanity, the Yin Illnesses.

In more simplified terms, Yang Illnesses meant physiological illnesses, while Yin Illnesses meant psychological illnesses.

Since the unconscious state of Park Joong-sun was due to black magic, it meant that not only was his physiology injured, but his soul was also affected. Thus, it’s known as the Yin Illness. The reason why Kim Jung-ho opted for the Ghastly Thirteen Needles was to target this illness.

Roughly more than an hour later, Kim Jung-ho came out of the surgery room with his forehead covered in sweat. He no longer had the refined appearance from before. What he did wasn’t as simple as acupuncture, but an acupuncture session that required him to focus his soul. Thus, it wasn’t a small difficulty.

Shin Chae-won swiftly went up and anxiously asked, “How’s Joong-sun?”

Her biggest reliance was Kim Jung-ho, who was...