The Blood Gate from Hell

On the eve of the college entrance examination, the blood gate comes. The monster slaughtered the campus. Before my deskmate was torn to pieces, he pointed at me and said: "You... You smell of it..." The demon hunter team came to the rescue, but the captain subdued me with his backhand: "He has the breath of hell - he is the 'door key', and the bloody door opens because of him." They say I am a walking disaster, a beacon of hell on earth. They said that once the door inside me was fully opened, the world would be doomed. Until that day, I pushed open the door—— Behind the door stood a man who looked exactly like me. He smiled and said to me: "You're finally here. I've been waiting for you for a long time."