So im not the only one thinking this. Im trying so hard to understand whats going on
It might be the translation and I don't remember what happened in the last chapter so I'll try to explain as much as I can:
MC/ black haired guy lost his lover to a murder. He wants to find out the murderer because, 'revenge' obviously. He somehow finds out that ML is an accomplice/ friend of the killer and plans a way to use him to get close to the killer. ML notices this but instead of defending his friend or getting rid of mc, he offers him a deal to work together against his friend because it turns out his friend also did something to him in the past making him really resent his friend.
mmmmmm I don't seem to understand whatever is going on here lol