The Crown Prince Has Lost His Mind (Bilibili Official)

In the 30th year of reign of King Taesun of the Gye dynasty, when the sickly prince had lost his soul and was close to dying, the emperor ordered the High Priestess Oh Yeon to perform Chohonsul (a ritual to bring the soul just before death back into the body). Because of this, the prince opened his eyes again but he doesn't even recognize his father and starts talking nonsense.