Jeong Gu-won is your demon husband who has powers and makes deals for peoples souls. He made a deal with a woman a long time ago for her to have success in order for her soul you were watching and Jeong Gu-won didn’t know and the woman comes back saying the deal is off and that she wants her life back and Jeong Gu-won says

Jeong Gu-won: what do you humans think a demon is? Do I look like some Angel?

The woman falls to the floor in pain from Jeong Gu-won having her soul and you were shocked