Before we head into Jaehyun's acting, I will briefly say why I gave this kdrama a 10/10 rating. I loved it. Simply as that. Quite cliche but it doesn't affect my opinion. Now about Jaehyun, he is GOOD, contrary to what I saw on twitter from people who never even watched the series. He still has room for improvements and that's just right since this is his first acting experience. But take note: THAT DOES NOT MAKE ONE A BAD ACTOR. Honestly, he is way too good for a first-time idol actor. As a common viewer and a non-Jaehyun stan, I say I'm impressed even though it's his first time. His acting isn't cringey like other kdrama male leads, it's very in-character. His eyes show so much that he doesn't need to open his mouth or scream "I'M SAD! I'M GONNA CRY!" for me to feel the pain his character feels. I empathized with his character because of Jaehyun's acting, I applaud him for that one. Not every actor can do that without providing a white actor's Oscar-winning scene. Congratulations actor Jaehyun!