Can't remember name, pleading for help

Hello generous people of the internet, I come in peace phahahahahahahaha, kidding. Moving on from my pointless humor, I read this manga or manhwa once, about some guy who's a gatekeeper?!?!? And his grandfather was also one once, but he was killed by some boss ass red head bitch. Anyway, dude loses his title as a gatekeeper in chapter one and has to start all over again. Oh right!!! It's a game of some sort... Look, my thoughts are jumbled, life expectancy is short and I've been waiting for Rick and Morty season 4... I'm a mess. So someone please help me.