I think I'm falling Inlove with my so called sister

Alam ni Steven sa sarili niya na masaya siya, he's rich and handsome. What can he ask for? Pero may kulang talaga.! But everything changes when he's father got married again. In instant may step brother na siya at step sister daw?? Daw kasi hindi siya sure kung ano ang nararamdaman niya. Will this new Family work? or this new love will work?