I haven't watched the Korean version of this drama but I could say this is one of the best suspense Japanese drama I have ever watched. It is one of the dramas that left me a great and deep impression that will last for a long time and probably it will stay. It's one of the unforgettable dramas I have ever watched. It's really haunting. With the story, it is not a typical revengeful type of drama because I like the twists and turns of the story. But most especially I really like the acting that the cast portrayed here. They really did a great job from main actors to supporting ones. They really gave a great, lasting performance. I love their facial expressions. I like the acting of the two main leads: Ohno Satoshi and Ikuta Toma. They totally owned their characters. I could call them with their characters' name in the drama than their real life names already. Aside from that, it has a great soundtrack. The music is not annoying. It really fits the pacing of the drama. I really like the theme song: Truth. I could re-watch this whenever I feel like it. It's not boring. I finished it for 1 1/2 days but I guess if you are really hooked you can finish it much earlier than me. It's one of those dramas you can't put down easily and you can't stop once you watch it. ONE OF THE BEST ENDINGS EVER. Totally leaves you with a deep impression you will never forget. Beware! :)