You were recently recruited and you joined the Port Mafia because Mori saw how much potential you had.

He was experimenting on you and doing a skin biopsy to see what makes your body unique… and he found a tumor in you. And he continued to do stuff. Apparently, you had more white blood cells than the regular human. But it’s also quite bad. You had more mast cells too. As you had Mast Cell Leukemia. The most dangerous of the Mast Cell disorders..

“Hm… take your shirt off..”