I waited until I finished all episodes before writing this. I like the story a lot! It's unique and it kept me guessing who the killer was and what's the motive. At first, there were a lot of flashbacks which can be a bit confusing but as the story progressed it just kept getting better and better. It kept me at the edge of my seat! It's thrilling, action-packed and the storyline is the best. The acting is believable and the songs are good as well especially at the end scene where it gave me goosebumps and it's just hauntingly beautiful! I'm not so much into kdrama (I only watched Squid games and Jirisan and a few more which I didn't finish) but I'm glad I gave this a try. I love it!
Highly recommended! A must see!