Na Honja Necromancer

Seong-Woo is a former special forces soldier who has returned to college after completing his national service. His ordinary life as a student is shattered during class one day when he and his fellow students are faced with a mysterious prompt asking them to “select a role.” Seongwu chooses the necromancer, a rare ability that grants him the power to control the undead. With the campus and outside world seemingly on the brink of collapse, Seong-Woo must use his newfound powers to battle fearsome monsters and help save his fellow students. But will they make it out alive?

(Source: WEBTOON, edited)