Dine With a Vampire

Sooin eagers to be free because he is trapped in an abusive relationship. Chi-hwan is a vampire who dislikes human blood and only drinks the blood of other vampires. Chi-hwan makes an attractive proposal to Sooin when the two meet by happenstance. In exchange, Chi-hwan will set free for Sooin from his living hell, but Sooin has to allow Chi-hwan to take his blood in exchange. How would this suggestion impact both of their lives?