I just finished watching this drama, and it's become one of my favorite dramas ever. It had a few flaws, I would've liked some characters, like Ye Na, to have more development, or at least not appear only when it was conveniant to move things along.
I loved the plot. Sometimes you find some things predictable, but this drama really managed to surprise me with every episode. I'd also like to say that Seo Kang Joon COMPLETELY stole the show. I really loved to watch his acting, all of his expressions, I think he did an amazing job portraying both characters and making you relate to both. Even the vulnerability, pettiness and jealousy of human Nam Shin. I haven't seen him in other dramas before this one, but I'll watch anything he appears on, from now on.
I also really liked the main couple. They didn't have a lot of skinship momments, but I thought the chemestry between both actors was amazing (to the point that I even shipped her a little bit with human Nam Shin at times). I also loved how their relationship was slow burn and natural and built on trust.
I would've liked a little more development between him "dying" and the time-jump, to see human Nam Shin cope with his mother's day and gain redemption. I also would've liked more flashbacks between him and Yeong Hoon, or Ye Na. I totally bought his bond with Yeong Hoon (and I think Yeong Hoon is in love with human Shin,tbh, they're endgame on my mind), but with Ye Na, not so much. He treated her like a lackey most of the time, was condescending to her, and even threatened to harm her to manipulate her father. I just simply couldn't understand what made her stick by him, because we never had any scene, flashback or current time, in which we saw Shin actually care about her.
I think the writing of this drama was amazing, and the question of what makes us human was nicely shown in each characters flaws and vulnerabilities. How we lash out when we can't process the pain, how we run away when things get to be too much, how we come back and try to do better and have to make an active choice to be kinder, to be better.
I really loved this show, to the point I didn't even want to finish watching it. And now I did, and I feel that warm, aching space left when a story you love finishes, and you stay lingering, hoping to see a little bit more.