What's the tittle of this Thai Drama ? !?

It's about how this one girl was asked by someone she really loves [ I think it's her so called Grandmother ] to take care of a guy [ who's the same age as her ] who's really rude , mean , & plain spoiled . He's also very rich because of his father but he his mother died & now he has an stepmother & stepbrother who're trying to steal all that money away from him or trying to get his inheritance , & it's her job to make him a better guy so that his dad won't give it to his stepmother & stepbrother . & in the process they fall in love together even though in the beginning they hated each other a lot ! Please Answer If You Know ! Thanks !