The Poison King: Now that I've Gained Ultimate Power, the Bewitching Beauties in My Harem Can't Get Enough of Me

Thirteen years ago, a terrible monster called the Poison Queen attacked the Jade Kingdom. A brave party of adventurers defeated her, but in the process one of them was stricken with a curse. In order to survive, she had to pass it down to her own son. Scorned as a cursed child since birth, Caim Hals