blood bank
kinda
i think the blue king in: http://www.mangago.me/read-manga/5_nin_no_ou/ is a morally grey character? or maybe the red king. i'm not sure. best bet is on the blue king.
(it's not a webtoon, but it's a good fantasy manga)
http://www.mangago.me/read-manga/god_of_war/ (Kratos)
http://www.mangago.me/read-manga/dear_boy/
Sorry I don’t usually read webtoons only these ones came to my mind
And if you’re partial to that kind of characters you should watch Psycho pass there is a hottie in there that fits your taste perfectly ლ(´ڡ`ლ)
Any recommendations for webtoon with morally gray characters? A fantasy setting would be nice too but it doesn’t have to be :D thanks in advance!!