You had a relationship with sugars brother for 4 years you both loved each other so much. But you had to broke up with him cuz of your sister because she loved sugars brother and so did your parents forced you to break up but when you broke up with him sugars suicided and Suga think all of this is because of you he didn't knew the real reason so he though of taking revenge by marrying you and making you suffer On the marrige day