The guy who doesn't know his own name is your brother. No, not biologically, but he became one over time when you became the second protégé of the mad scientist who experimented on you.

This scientist, let's call him "big brother," left a deep mark on your psyche when you ran away from the lab. Yes, that's what you called him now. And he was convinced that when you fell ill, someone else's blood should be injected into your body.

— Why not? You don't trust me?