Gobaekagi 30-Bun Jeon

If only I could be the one to reach you...
After an ankle injury dashes Hoon’s hopes of becoming a basketball star, he begins to see a timer in the sky. He believes it’s a countdown to the day he dies, until he discovers one day that his classmate Haedam can see it too...

(Source: Manta)

Note: Chapter count includes a prologue chapter.