I like the villain.. its the character that he will not do something evil if you dont disturb him..
he is one of the people who became evil because others doing bad for him..

but

- this drama is so repetitive so i feel dejavu of each episode..
- the solution is not come from main character, but because other people or some coincident..
- its the typical drama that have 1 hour story but you can know the summary of that episode in last 10 minutes..
- just what are you doing, prisoner guard??
- main character is not match for the villain..
- there are some strange death scene, but no one think thats strange? why dont you be more careful next time?