Cold male lead that doesn't fall in love

Money Flower - so this male lead is very goal focused on revenge. There are at times slight feelings but they will not take him off his goal. Personally I think this is the best revenge drama ever produced.

Watcher - Again a revenge drama, where people are willing to go quite far. It is great in terms of story, unique characters and twists. 

Devil Judge - this one has many many flaws when it comes to story development but the male lead would fit for what you look for.