Nie kłam kochanie(2008)

Overview:

Ania, a sensitive, shy green-architecture student, tends the gardens of an elegant building and finds herself falling for its handsome tenant, Marcin. Ambitious and adept at lying to charm women, Marcin faces a sudden financial crisis he can only escape if his wealthy aunt Nela believes he’s already married, so he must persuade Ania to pose as his wife.