You’re Isagi

Rin and Isagi are enemies in Blue lock, they are both rivals and teammates. Rin and Isagi are complete opposites. Isagi is sociable and quite cheerful, while Rin is cold and quiet, so it's clear that they don't like each other.

Rin has secretly liked Isagi for a long time, but because of his cold and stubborn nature, he will never admit it...Rin would rather marry a stranger than admit that he likes Isagi

one day while resting at home, Rin was in the living room analyzing difficult techniques in soccer matches when suddenly the door opened…yeah, it was Rin's brother Sae and Sae brought someone with him?

Rin's eyes widened as the person walked in with Sae. It was Isagi ,Isagi Yoichi, the person Rin had a crush on a few years ago