The comedy in this film is best during the first act of the film. It slows up, and by the third act, it's pretty serious as Moo copes with his emotions and you learn how he got into his predicament.
But it's never overboard or maudlin. Subtlety. It's something a lot of films -- especially Thai romantic comedies -- lack. But Komkrit finds a balance that's just about right. It's sweet without being syrupy.