Part One: Fighting against Class 5 Monsters

(From MC's perspective)

Underground chamber, 

I spotted a narrow hole that leads to the surface. Seeing that, I confirmed Eric must have come from here. Other than that there is no other entrance/exit to this underground chamber. 

The narrow hole is like another secret path that leads to the surface. My eyes gleamed with a twinkle. I already searched the nook and corner of this place. 

There are no more books and other experimental stuff. Every other lab equipment got eroded over time. Finally, I decided to leave. Before leaving there is one more thing to take care of. 

I can't leave the corpse here. There is a mutated forest ahead. It's better to dump the corpse there. After figuring it out, I picked up the cold corpse and moved toward the narrow hole.

A few minutes later,

I got back to the surface. My gaze turned towards the ruin. I don't know what is happening out there. But in a few hours, the sun is going to rise.