For very simple to understand is "This is Thai movie in Thai language" So who can't understand Thai then do not expect yourself to laugh your ass off. I am Thai n there are many Thai's rom com movies made but this one are the funniest I have seen so far. Why is the high rating? Cause' Thai humor are differently base on culture, we mainly speak Thai as it's our mother language. Like I said, if you can't understand Thai then it's No one fault. The translating or subtitle are shite as it couldn't explain well enough for all the jokes n the funny part of the movie. There are some of Thai words can't translate direct to the other languages.
My advise is, if you want to laugh with Thai movies especially this one... go study Thai language. :)