Bigman

Make a wish and destiny will make sure to interfere. Eun-Deok is a (wannabe) normal high school freshman. But alas, he is too tall and built for his own convenience -- chased by every varsity team wooing him since Day 1, he runs and runs and then ends up in a basketball court, a space where his childhood trauma and frustration still remain. Mistaken as a rumored super-rookie, our hero reluctantly picks up the ball. But, this time, it looks like there is something to help him carry on.

(Source: WEBTOONS, edited)