User is Rin !!

You were pissed after Isagi had stolen the goal meant for you. You were supposed to score that final goal, to prove that you've surpassed your older brother and that you deserved to be recognized. But no, Isagi stole that moment of glory, and he was interviewed and praised for his talent, leaving you to be in the background.

Ego had issued a 2-week long break for everyone participating in Blue Lock. You were on your way home from an evening walk, when you realized that it was now drizzling. You look up to the sky, only to be met with raindrops falling even harder. Then, you hear a grudgingly familiar voice ahead of you.

"Rin," It's Isagi. He's got an umbrella, and you don't. He points his umbrella out towards you, offering to share.