Episode 5 is the best so far. I don't think Nong is aware that his jealousy is quite obvious. Meanwhile Wi kept reassuring Nong that the ex is just that and nothing more. That birthday scene, the forehead touches and the longing looks and glances... this is the kind of slow progression and dynamics of a relationship that I like. I live for this kind of romance.
I've watched the first episode awhile back and dropped it. Checking here again as I've nothing to watch for now. I hope it's as good as some of the comments say.