CN or KN Novels with an OP/Cold MC. Harem is fine as long as it isn't the main focus and Male MC only. If you're gonna reply "Every CN or KN novel ever......" please get a life and come back when you learn not to be a dick. He doesn't have to be cold, but I would prefer if he was able to make ruthless decisions that would help him in the end. So basically I want someone smart. Thanks!
Hmmm..only one I can think of on top of my head is the KN, Everyone is a Returnee. Op? Most definitely Cold? That is debatable... Cold/Ruthless towards his opponents/enemies, but not constantly cold to those near him.. Try that one if you haven't yet.
The Legendary Mechanic is pretty cold, or at least clear headed Pursuit of the Truth (I haven’t read it all yet), so far is pretty cold headed Superstars of Tomorrow is very clear headed Mc King of the Battlefield (?) errr less cold headed, but still cold Trash of the count’s family... um , he is special. Not “cold” per se, but so lazy that he has to do everything in a smart way so that he can continue to be lazy?
C-Novel: The coldest MC that I've come across: Reverend Insanity. The guy would pretty much do anything to survive. Super sociopath. The 2nd coldest would be: Renegade Immortal. The original persona is actually very kind, but the world is cruel to him. This one has a warm MC, but ruthless to his enemies: ZhanXian / Immortal Executioner. This one is... a bit unique. The MC is very arrogant, but he indeed has the right to do so. He's basically an immortal demi-god, reincarnated into a human body: Emperor's domination. K-Novel: This one has a warm MC, but he can do what need to do to achieve the best ending. Even if it means killing innocent: The Novel's Extra. This one has a sociopath, calm, calculating, and good humor MC: Dungeon Defense. Similar to Renegade Immortal, the MC is forced to adapt to become sociopath: The King of the Battlefield This one is a bit special. Basically an OP guy that is numb to killing people and hated by his own kind. All to save the world: Main Character Hides His Strength