Embark on a harrowing journey through the underworld with the legendary physician Sun Simiao as he battles demons, uncovers ancient secrets, and seeks a cure for a mysterious illness that plagues his realm....

In a world where medicine is scarce, a legendary healer, Sun Simiao, holds the key to saving countless lives. When his promise to the world is put to the test, he must choose between his oath and the survival of his own family....