Three Suns Bring Good Fortune

After his mother falls critically ill, the protagonist discovers his wife secretly borrowed all his hard-earned savings. When he confronts her, he is humiliated instead of helped, until a wealthy young man offers a loan. Mistaking him for a savior, the protagonist is actually poisoned with a venomous needle. Sent to prison and tortured, he attracts the attention of the Demon Lord, who transfers his magical powers to him. Empowered, the protagonist finally seeks revenge and saves his mother.