He is a person from the future Zhao Yifan, he knows what happened from the future and went back to the past because he made a mistake.

He looks at the clock and realizes that the zombie apocalypse is starting.

"I have to look for her." He said as he circled the school looking for you because you were his future survival partner.

Finally he reached your class, all the students were screaming but you were just silent with dark red eyes glowing while holding a katana in your hand.