They both have a similar idea of assistants pretending to be their bosses. Except that "Fai Gam Prae" is more of a drama with a touch of dark comedy, while "Fun Fueng" is more of a romcom
Both dramas deals with characters pretending to be someone they are not and the hi-jinx and complication that comes after to keep the lie going. Both are lighthearted rom-com that are enjoyable to watch with handsome male leads.