I've just finished "FirstLove" and this is a drama that I'd suggest that everyone just give a miss. The main cast are all very young (i.e. teenagers) and they are clearly very inexperienced actors. There is no chemistry at all between the couples, which is probably a good thing considering how young they all are. Production is low budget with some sound issues. The plot lacks clear direction, editing is choppy at times and the dialogue is cheesy.
Although it had a few moments where it got interesting, overall its just bad. Unless you're a person who watches every single full length Thai GL that gets made (like me), just skip this one. You won't be missing anything.