To begin : I haven't really been a fan of dramas about 'crimes' and 'police' . This has been the second one I watched. It was the best choice I have made, to give it a chance. From the very first episodes you can feel the power of this drama. And by power I mean, it's magic, it's beauty and it's intense action. Yes, the action was so good, so interesting, that it captivated me and without noticing I was already absorbed in the story. Initially I didn't realise how much complexity each character's psychology had. What it actually means to become an undercover police officer? A person who has to live as someone they are not and become that someone in order to survive in a 'cruel world' . A place where crimes and justice go hand in hand. And by that I mean that for justice to be made, crimes are needed and so is for crimes, 'justice' is needed for them to happen. And after all that, how can you still trust those around you? How can you still trust yourself when you will never be what you used to be. Also, the acting was brilliant. Each actor had an unique role and each role had it's importance in all the crazy action that just doesn't seem to stop. It will make you stop breathing, it will bring you from shock to tears and from tears to relief. But don't just wait for everything to work out easily, as it will get more and more awesome! The music was perfectly placed and it made all the cool fighting scenes and all the intense interactions, even more realistic and more enjoyable to watch. In a nutshell, this is your cool, fun to watch (if you like the adrenaline or action of this type of drama - i personally didn't, not until I watched this) and with an incredible story drama, this is truly worth watching whatever your preferences are. This made me fall in love with this type of dramas. Want to try it? Don't think twice!