I literally feel like I just watched it; but it was a drama where the couple gets drunk, they sign a marriage certificate and it ends up the certificate is fake or something and they’re not actually married? I can’t remember what it is; It sounds like a Thai lakorn but it could be a chinese drama or even korean. Help! 

I think that is Korean drama called one more happy ending ... just check the trailer

Maybe can’t help falling in love?

Could it be Drunken to Love You ? I know they get drunk and get married but it's been a while since I've seen it so I don't know if later they found out it was fake or not.