A sister, excitedly on a video call with her twin brother, suddenly watches unknowingly as her brother is murdered in broad daylight--pushed from a school window and plummeting to his death. This initial hook in the first episode got me excited about the potential of the plot. I was not only empathizing with the sister, who had just experienced a severe loss and is now on the hunt to find her brother's murderer.

Major Spoilers:

One of my main issues with the show is that there were so many irrelevant factors, Ji Sooheon's brain tumour becomes a useless fact that is only used as a way to make the audience sympathize with his character faster, the loss of his mother is also one I found quite random. Then we have one character who is pregnant, and once again adds no relevancy to the plot.

However I was able to accept all of these if the ending was satisfying, but instead, we get a cop-out ending with the classic case of split personality. It really felt disrespectful to the audience to have this over-used plot element as the 'climatic' ending. I felt like I wasted my time with the show, after all the build-up they also kill Ki Oh Sung in the ending, which felt so rushed and not needed.

Plus why in the world is a man with a brain tumour being hit dozens of times in the head and coming out practically unscathed each time, it was as if he was invincible and it made me not want to take the plot elements seriously. The whole show, near the second half, felt so lacklustre and rushed. Most of the 'clues' and 'evidence' we are the audience are given as basic boring ones like the murderer being left-handed and using his left foot to commit the murder.

I really had high expectations for the drama, in the first half, which is why I'm angered by how the plot ended up. It would've been better to have Jaebum not lose his memories and join Chanmi & Sooheon's group, then we as the audience get attached to Jaebum only to find out later that he is the murderer and was only using them to cover up his murder. I would rather they played into Jaebum being a pure villain, rather than a half-baked split-personality villain.

There were so many poorly written elements that made me frustrated with the show and honestly I regret watching it.