I saw a lot of people mention the book the metamorphosis , and I think those theories are great , but I haven't seen anyone mention "hell is other people" which is another title from jean Paul Sartre . In the play, three people are trapped in Hell — which is a single room — and ultimately while confessing their sins to one another, end up falling into a bizarre love triangle.

" Hell is other people has always been misunderstood. It has been thought that what I meant by that was that our relations with other people are always poisoned, that they are invariably hellish relations. But what I really mean is something totally different. I mean that if relations with someone else are twisted, vitiated, then that other person can only be hell. Why? Because … when we think about ourselves, when we try to know ourselves … we use the knowledge of us which other people already have. We judge ourselves with the means other people have and have given us for judging ourselves. "


The hell here would be the studio , as he is trapped in there he starts to go crazy and by "confessing their sin" we can maybe think it's about how the dentist forces him to bring out the "psychopathic" nature in him and his killing urge .
"We judge ourselves with the means other people have and have given us for judging ourselves." The people around him make him think he's overreacting and imagining things , that the people there are okay and he's just paranoid , so we literally see him become more and more paranoid during each episode , as he starts to believe what other people (especially his girlfriend) are telling him . We can also interpret that , since the dentist keeps telling the protagonist he's just like him , that's why he starts to believe that . His coworker says he only pretends to be a nice person on the outside , so Jong Woo acts as according to those prejudices , smashes his keyboard and beats him up sending hum to the hospital. If we take the metamorphosis in question , as the protagonist begins his transformation and becomes a bug , he completely forgets what he used to be like and starts to become what the people around him think he is , paranoid , crazy , rude , a murderer .
This is just my theory based on what I heard about these books , I'm going to try reading Sartre and Kafka and completing the webtoon and see if I can correct it or come up with something more .

This drama is really amazing , I watched it in one day . The actors did a really great job , especially Lee-Dong Wook , it's not easy for an actor with an already established image as a sweet and nice character to break form that and play a completely different role as a psychopathic killer , but he managed to do that and played out his character really well . This is my first time watching Im Shi Wan and he did great as Jong Woo .

If I have any complaints about this drama , it would be that the last episode is a bit rushed , but that's the case for many dramas so I'm not going to hold it against it , overall this was a thrilling and exciting watch , definitely worth a rewatch someday .