I Became an Academy Counselor - Chapter 8: Admonition

Before going to college, an ordinary high school student went to celebrate and got drunk. When he woke up, he found himself in a completely different world. There was a big sect, the approaching sect entrance examination, a slum where his body’s previous owner lived, and a shared memory about a missing young girl.

When he got tangled in a fight with a few punks in this different world, he fell off a cliff and miraculously found himself still alive, with two more voices ringing inside his head. They were Sword Master and Saber Master. In the company of them, he continued to find out more about this whole new world. He took the sect entrance examination, entered the sect, met a strange man in black, and even participated in a major competition of the sect to have a chance to win over his peers!
In this whole new world, he was born again and got to explore the fantastic martial world!

- Description from Novelupdates

Ryo Tanaka, a struggling college student, works tirelessly at multiple part-time jobs to make ends meet. In a bid to earn some extra cash, he volunteers for a paid drug research study, unaware that it will alter the course of his life forever.The experiment takes a disastrous turn, leaving Ryo bedridden with a high fever for several days. But when he finally awakens, he finds himself in a world plunged into chaos. A deadly virus has ravaged the city, turning its inhabitants into ravenous, flesh-eating zombies. Streets once bustling with life now lay desolate, the remnants of civilization crumbling under the weight of the apocalypse.

The six prefectures of Zhongbo were offered to foreign enemies on a silver platter, and Shen Zechuan was taken into custody in the capital, reduced to a drowning dog—loathed and condemned by all.Xiao Chiye followed the scent of the furor and made his way over. But instead of setting others on him, he kicked Shen Zechuan with his very own leg, rendering the latter an invalid. Who would expect this invalid to turn around and bite him in a counterattack until he was all drenched in blood?That was the start of an epic feud between both men who tore at each other every time they come face-to-face with one another.“Fate wants to bind me here for life, but this is not the path I choose. The yellow dust submerged my brothers deep under. I have no wish to bow in submission to an illusory fate. The imperial edict can’t save my troops, and the imperial court can’t fill the stomachs of my mounts. I’m no longer willing to lay down my life for this purpose. I want to surmount that mountain. I am going to fight for myself.”Note: A ‘drowning dog’ is someone who is down and out, having lost favor or power.

Su Yu was in a third rate university when the “Sky Holes” appeared, his school fell through the “Sky Hole” and appeared in the middle of a forest that was teeming with terrifying creatures.