We shouldn't treat Nakwon as a cold-calculating person. I too, thought he should be someone who is emotionally detached from everyone but Nakwon surprised me from the very early chapters. He is not your average cold-hearted person. The things I personally found interesting about Nakwon was:
1. Nakwon has an actual personality.
He is not emotionally detached at all. Just a career climbing adult. It was obvious when Nakwon yelled at Mokhwas underlings because they were not of help at the flower shop. He ended up helping everyone and even typing the flowers. He got annoyed and mad and made it clear in a very human way.
He also bullied his lawyer friend and told him he didn't shower for days. He revealed to him how interested he is in the Mokhwa gang case instead of keeping it a secret from everyone. It showed that, to some degree, they were close. The same thing happens around his college friend. The friend asks him to be there for an event because he needs his help and Nakwon actually agrees. He only came to that party to help a friend out, an act that he didn't need to (he didn't want to initially) but yet did. So Nakwon does care for the people around him to a certain degree and does nice deeds sometimes without anything in return. He is able to joke around with people he knows well.