Kinda like Gu Daoist Master , where the MC doesn't really have care to family/sect. Smart, calculating, ruthless.
God Of Slaughter has a lot of family and bit spoilerish entire planet or race? (I forgot been to long) to save. So its a no go.
Emperor’s Domination calculating, ruthless, solitary, deep plot Dragon-Marked War God ruthless, straightforward but consistent plot Gu Daoist Master ruthless, deep plot Plundering the Heavens calculating, ruthless, solitary, anti-hero very similar to gu daoist The King of the Battlefield calculating, ruthless Master Hunter K just solitary, a bit dumb, straightforward plot Revolution of the 8th Class Mage calculating, solitary, smart Seoul Station’s Necromancer anti-hero, ruthless, solitary, Reincarnator The most solitary mc ever. smart, calculating everything. The Crimson Dragon anti-hero, ruthless, solitary, mediocre plot Zombie Evolution anti-hero, ruthless, solitary, mediocre plot Dungeon Hunter anti-hero, ruthless, calculating, solitary