what the hell

there's this one manhwa with i think a 2nd life in the modern world/regressing/reincarnation/whatever plot and i remember that i really liked it but i don't remember the name of it, what the plot was, what the MC looked like, or what his name was. i only remember that like other Mary Sue's, he was a fucking genius in his field. and i don't remember if it was a military thing or just an academy thing or something but i vaguely remember there was this douchebag that MC got roomed with at the academy thing (i have no idea) and he had glasses? apparently this guy was team leader of a unit but he was so fucking bad at it so the MC had to step up and tattle on his ass. the douchebag didn't like that so he reported him and i think got a lawyer??? MC won though obviously. there was also something that had to do with picking up the group members... something (maybe signatures? attendance?) i have no idea. lmk if this rings a bell cause i cannot remember for the life of me. i SWEAR i marked this (the MC probably has the default build: average joe, idk kind of a pretty boy, black hair)