So many spoilers sorry.

WHY?! Just whhhhhhy??? They'd fixed everything they really needed to by 15 (they could have just shifted up the side plot to resolve then as well.) but no.. they felt like they needed to add a 16th episode where the main couple break up for the most ridiculously contrived reason ever. Obviously they don't get back together because the man would have to be a complete idiot to take her back after she dumps him because, and I paraphrase "looking at you would make me sad that my father was a jerk." Seriously??? wtf. On top of that she ghosts her best friend's wedding because she's too busy being petulant?!? Girl doesn't deserve Ja Sung. Her anger when he left her earlier on was completely justified but they managed to resolve things. However this ending is ridiculous and completely out of left field. Why they thought they should ruin such a cute drama with this rubbish ending is beyond me.