Responses
I don't think that's it though. He said he doesn't want Bada to find out about the cassette tapes, so he is hiding something from Bada. So it doesn't have anything to do with Bada telling him to not let the NPCs interfere; Bada has no idea this happened. Nam even went out of his way to hide the body. I think people are confused because they don't know why he killed the cousin, but like we aren't supposed to know yet haha, that's the whole mystery that we will hopefully learn more about in season 2.
I don't understand why people are confused about the last chapter (it's perfectly possible that I missed something). Didn't Bada tell Nam that he didn't want any of the NPC's to interfere? Nam being the sane individual that he is took that to mean murk anyone that does that, right? ╮(￣▽￣)╭