It's pretty obvious the movie was made mostly to showcase Jaejoong's abs and promote his solo album. Yet, I think it's a pretty enjoyable movie. The plot was corny but the general acting was pretty good and I really enjoyed the humour.
As for Jaejoong I honestly think that his acting was really good. Both the comic and the dramatic parts. I thought I'd seen all the Jae!faces by now but nope. The part where she tried to figure out whether he was the real celebrity or not was hilarious and seriously all that voice-imitation talent came in handy. Even that weird thing he does with his tummy... Or maybe they wrote the sсript based on that)) Either way, good job, Jae! Momma's proud.