The Hero Wants to Die

At the age of 19, Kim Gunho finds himself transported to the 23rd century, equipped with enhanced abilities. After enduring 50 arduous years to prevent an impending apocalypse, he returns to his younger self at 19. With the danger now eliminated and no one aware of his past struggles, all he yearns for is peace, even contemplating death. He faces a period of 100 days to completely eradicate his enhanced cells. As he gets ready to spend his last days in tranquility, he is unexpectedly visited by Ye Haejung, the boy he had secretly loved prior to his time travel.