Inseparable as siblings, Jeff (Ryan Agoncillo) and Kat (Maja Salvador) grew up very close to each other through thick and thin. Kat being overzealous and very wary of girls who likes her brother Jeff. Her Kuya simply means the world to her. Years later, Kat is all grown-up and lovely, and soon awaits her Kuyas return after four years of hard work from abroad. But all this excitement of a sibling reunion is foiled at the airport upon sight of Heidi (Pauleen Luna), Kats worst nightmare and her brothers fiancée. Kat is crestfallen by the sudden presence and inexplicable devotion his brother has for this new girl in his life.
