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/
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.
HI GUYS. PSYCHOLOGICAL PLS. NO YAOI OR YURI OR ROMANCE. I PREFER MANGAS. THANKS.