Lucky Game (1986)

A wealthy elderly woman, Mrs. Liamthong, suddenly appears and reveals that Kesara, a young woman who is having marital problems, is actually her true heir. Mrs. Liamthong is willing to give Kesara an inheritance of one hundred million baht, with the condition that Kesara must have a husband who meets her expectations. Goy, Kesara’s close friend, devises a plan for Aeh, her own husband, to pose as Kesara's husband in order to split the inheritance. However, chaos ensues when Kesara's real husband unexpectedly shows up.