In regular kdrama terms this is about 4 episodes long and that is just the right amount for this kind of story. Had this been extended to 16, I'm sure it would have been an unwatchable makjang show for me.
The acting is good (Hani is excellent), the chemistry between the leads is also fine. There is not much fluff, but the romance is really realistic . The plot itself is quite juvenile & silly, but due to the short length it's quite bearable, though I think the show would've been better if the ex stayed away in the current timeline. The whole bartender thing is quite unique as far as kdramas go and even the toxic sismance is interesting.

XX is totally worth watching!