Happy Hearts is about true love between a young man and a young woman, a son's love for his father, a father's love for his son, and true love between a man and a man. Alvin (Rayver Cruz) returns to the Philippines with her mom Sarah (Jean Garcia) to visit his father, Enrico (Rustom Padilla) a respected professor of an exclusive university for boys and his godfather Louie (Wendell Ramos), a sing-along master and who happens to be Enrico's live-in partner. Alvin falls in love with Kristine (Shaina Magdayao), a rich and talented girl who lives under the strict hand of a very influential father (Tirso Cruz III). Can love survive the odds? Will Alvin fight for his true love? Will the man get to keep his romance with the man? Will everybody's hearts indeed be happy?