The main characters in the present get a happy ending but same cannot be said for the characters in the Joseon. The writer should have put much more thought in the story and also tied the past properly. Too many loose ends.

What about her parents who treated her great? Their daughter just died.

What was the point of saving Tae Ha in the past life, he just dies later on. And during the time he lives he has to be stuck with a wife who's in love with his reincarnation and he is completely clueless about the identity of this guy.

The past Tae Ha should have gotten to live a long healthy life. It felt a lot like present Tae Ha stole Past Tae Ha's love, even though I was rooting for the present Tae Ha and Yun Woo to end up together, I can't help but point this out.