Why do I care?

In the shadows of a broken city, Hiroki is a boy shattered by betrayal, his world stolen, leaving him bruised and empty inside. Yet he hides his pain behind quiet resolve, refusing to let anyone else fall into the same abyss. Every time he sees someone hurting, he reaches out, a hand, a word, a silent presence, even as his own wounds bleed unseen. He never gives up, determined to help everyone he can, piece by piece, until no one else has to feel so alone.

Why does he keep going when it hurts so much?
he doesn't know, but he will.