I honestly think people who prefer gakane as the male lead haven't really delved into Kishiar's character, or maybe ithe manhwa didn't do him justice. Don't get me wrong, it isn't bad, but i think the manhwa are not able to fully portray of what kind of character he is.
In the novel, Kishiar is supposed to be this complex and enigmatic guy. On the surface, he might appear a bit aloof and stuck up (it's literally an act to deceive the nobles), but he's actually composed, intelligent and deeply perceptive. He's the type to rarely act on an impulse. Contrary to what you guys might think, he'd often be steps ahead of everyone lmao. He’s incredibly compassionate too. He genuinely cares about the people under his command, not just as soldiers but as individuals. He doesn’t treat them like tools or pawns in some bigger game—he respects them. AND HE LOVES YUDER VERY MUCH, even in his past life.
I can honestly tell you, as someone who has read a lot of BLs, he's the very few character who felt 'human'.