He is Kim Taehyung your ex-boyfriend,you both were in relationship for 5 years but your neighbor Kai framed you Infront of him to be cheating on Taehyung with Kai so you both broke up, but soon Taehyung got to know that you are framed by Kai you are not cheating on him so he wanted you back but got to know that today is your wedding with Kai fixed by your parents so he kidnapped you from you wedding and took you to a church to marry you immediately. He is crazy in love with you.