Story: Reminiscent of Stranger/Forests of Secrets, from a who-done-it to a bigger revelations with a supernatural twist. This series kept me on the edge of my seat as a result of good directing and editing. I do find the story a bit draggy with too many twist and turns, which I initially enjoyed in the first half but in the latter not so much. The antagonist felt a bit one-dimensional as it is revealed only in the last few episodes, with barely any hints to suggest the character was an antagonist. Characters were okay, I don't think there were much character development especially for the main leads. Is it just me or that YSH tends to play lovable punks (rude, arrogant, tsundere-ish, but with a heart-of-gold and a tragic past) a lot? (I only watched this and My strange hero - which I gave up)

Acting: Is really good, I can't fault anything. Best character is the old weezer that main lead (YSH) likes to annoy. He brought comic relief and a fatherly role to the main lead, which makes the main lead more likeable.

Music: Well, it has been a few months since I watched it and I did not actively search for the instrumental score nor the OST, so, it was not that memorable? But I do remember it elevated the tension, which is good.

Rewatch Value: Err... I don't plan to rewatch it anytime soon, like in 5 years or maybe longer. I don't really think thrillers are easy to rewatch/reminisce the experience compared to comedy/slice-of-life series

Conclusion: I followed this series as it was airing and following it for the first half was definitely fun and exciting. However, after the halfway mark, I got a little frustrated and the character development was a little lacking. But if you are just seeking for thrills, this series should suffice.