Hyojo

Tai (타이), otherwise known as Hyojo (효조), is a demon.

Biography
Tai was created by Suri from a dying crow, the first to be created by her, and was named Hyojo. Hyojo then became involved with Chen, who convinces him to kill other witches. By killing other witches and stealing their cores, Chen reasons, Suri would be happier and less burdened by their demon bodies, that need a witch's energy to be maintained. This plan devolved when Suri found out about it. Suri then cut herself off from her external activities with Nathan, until Beom convinces her to bid a final farewell to Nathan. Mistakenly threatened that Suri would abandon him for Nathan and the human life, Hyojo kills Nathan, setting up an all out war between witches and demons.

After defeating Suri in an epic battle with her, Hyojo began hunting witches and took on the name Tai. He started capturing witches under the plans of Chen and Noir who needed witches bodies for their experiments for a new body. Centuries later, Tai discovers Suri once again.