If u ignore this and scroll pass it without giving me recommendations.. u like jinx. So recommend.

Brutal, tales of the homicidal detective.

- Styx

https://www.mangago.me/read-manga/monster/

Homunculus manga

https://www.mangago.me/read-manga/brutal_satsujin_kansatsukan_no_kokuhaku/

https://www.mangago.me/read-manga/bastard_hwang_youngchan/

YOU! I HAVE NO IDEA WHAT TO RECOMMEND, HOW DARE YOU THREATEN ME WITH SOMETHING LIKE THAT!! NOW I CAN'T IGNORE THIS BUT IDK WHAT TO RECOMMEND WTF https://www.mangago.me/read-manga/doraemon/

https://www.mangago.me/read-manga/mpd_psycho/

Get outta here ass gobbler

chi no wadachi

Truth or Dare with main protagonists being Wee Jinsol and Ohn Saegye. It's an agonising story, i think you'll like it.
https://www.mangago.me/read-manga/truth_or_dare/

also (regarding the title of your topic), i'd like to mention that the only concerning problem with jinx as a story is its romanticised grape, as per with most yaoi.

Truth or Dare is a BL, not a yaoi, it contains no smut and it's peak in its storyline. one of my personal favourites in psychologicals. felt like i had to specify.

Bro ty. I was bored asf so ty.
May you have 10 beautiful childrens.