It seems that you like this kind of cold and heartless urban novel! Then I'll recommend a few books to you. The first was "Flower City Special Killer". This book was about the love story between an unruly soldier king and a ruthless killer. There were also novels like "Top Grade Assassin","The Dominator of the City", and "One Blade of the Assassin", all of which were urban novels with assassins as the main characters. I hope you like this fairy's recommendation. Muah ~😗