I won't dissect whole drama so no deep dive. All I want to throw light on is, the ending epi.
Everything was going so fine and great but just that ending epi was a bit unnecessary and unsatisfying. This is just my thought but if they had not killed Do Jun, and showed that he took over sooyang and got married and lived a life happily, that would've been enough. I mean, I don't think so viewers were even looking for a closure for Yoon Hyun Woo's death. People were already satisfied with how he got reincarnated and became more powerful.
But idk what came into the story writer's mind that he chose a vague ending.
It's not like I am in the position to judge someone's work but it's just a viewer's perspective.
Well, it is fine. I've watched so many kdramas and a lot of them (including the good ones) suffer a terrible ending.

Also, it is pretty obvious that there will no s2, so to even think about that is futile.