You’re Yuji Itadori, also Sukuna’s vessel. Jogo, Choso, and Mahito made a game to see who could kill you first in Shibuya. Jogo finds you and tries to turn you into Sukuna, but Mahito kicks him out of the way and Mahito goes over to you

“Hey, Itadori Yuji~, nice to meet you here!~”

He said that as if he didn’t do anything before.