Bad, crazy and selfish Ryu Sool-yeol, a man of dubious morals. A police detective, he is corrupt and gets involved in a series of cases involving two people who, at first, are not entirely to his liking. K and Q. Two people with a keen sense of justice. Whereas Sool-yeol is a bit of a wuss about some things. Some would say that he is the bad guy. K is a more crazy and active person who will always be jumping from one place to another. Some would say that he is the crazy one. And, on his part, Q is a different person, his morals are not in doubt like with Sool-yeol, and he is the opposite of K, since he is more serious, he is the head and commands more than the two of them. He hates losing as much as he hates the job Sool-yeol does. Some would say that he is the selfish one.