Go Feral

At the engagement party between the female lead and her fiance, seeing her constantly humiliated and troubled younger brother (the male lead), he firmly believed that the female leads fiance couldn't protect her well. From then on, he made up his mind to take her away. From then on, no matter what the female lead did, the male lead would stick to her side shamelessly, determined to destroy the relationship between the female lead and her fiance.At first, she just thought her younger brother was clingy. By the time she realized something was wrong, she had already been locked up by him. However,this sudden transformation of their relationship into a romantic one was extremely unacceptable to her,and so,she began running away again and again.What she didn't expect though was that no matter how much she ran away from him , he would try every possible way to follow after using all kinds of methods,to ruin any chance of a future with his rival in love . And after being repeatedly refused by his sister turned lover , he became heartbroken.The enraged male protagonist decided at this point that if he could not have his beloved sister as a wife , then nobody else could either . But it is only now that he realizes why exactly it is they are engaged in such an unusual marriage arrangement - because back when they were still siblings ,he had offended some powerful force which has led them down this path.All along,she has been trying so hard just for him.Touched deeply by this revelation,the man decides henceforth,to pursue love differently.He starts finding ways gradually through actions rather than words,to win over his beloved's heart.During this process,she also comes around realizing why exactly their families agreed upon such an alliance initially,and understands finally why it is that back when they were still siblings,his offence against those powers-that-be,were actually attempts at saving himself.