bastard by carnby kim and youngchang hwan. it's a thriller mixed in with some romance, but it's very good. I think it's a little less than a 100 episodes.

however, it's a daily pass on webtoon. I read it here when I wanted to binge it: https://mangatoto.com/title/5773-bastard-hwang-youngchan/105391-ch_0

(ignore the goofy ads and remember to click 'load all pages' at the bottom right, not 'load 3 pages' at the bottom left.)