I love the fact that the two main actors are both on my favorite male actors list. Park Ki Young and Kim Yoo were great, but I love every moment with Mad Cow and Boiled Potato. Plus i learned a lot about the power of a computer in the hands of a vengeful person. It can be a tool for enjoyment and pain, because we share or hide our deepest secrets on a computer. We make up fake names and identities, so there is no shame or prosecution on what we desire, dream, and have obtained. The music was very appropriate at every high note and mysterious moments of a reveal for secret. I love the detective moments and learned about new devices and programs used in hiding and erasing/cleaning your computer. This drama was very action pack with many losses of innocent lives. So I recommend this drama for anyone interest in a action, detective and drama show that includes So Ji Sub and Choi Daniel for the main actors. YaY!!