I don't really like thriller, but I can binge-watch this drama until the last episode in only 1 day. I don't know how to say this, but this drama will just leave you speechless. Some ppl may say the storyline is predictable but I don't think that is the star of the drama. How every scene is acted, recorded & showed is beautifully potrayed, making the impact of drama so strong. And that's also why, I don't think this is for the introverts. This K-drama will trigger some part of us that most probably we'll never want to know... I mean, I'm an introvert myself so this K-drama really altered some of my brain chemistry rn. I'm not being overdramatic when I'm saying this, but the drama really making me feel like hating ppl, hating on how the world works & even feel hopeless over myself. I think I need to get some fresh air tomorrow. I don't know if I should praise or hate the director & the writer for making this drama, really.