The Boys of Summer

33 years have passed since the world filled with zombies. However, a boy named Lee Ji-Seung, whose blood can heal zombies, appears. For this, he is worshiped as a guardian angel to his people. Ji-Seung, who admires the Zero era (when there were no zombies), is strangely attracted when he is near a man who has just been awakened from his dream and who goes by the name of Jeon Ho-Gyeong.

(Source: Bomtoon, translated)