The Ruler Of Darkness - Chapter 10Book 5:

It has been about 30 years since dungeons were suddenly appeared in the modern world and Seekers, people who are adapted to dungeons, began to appear among the population.

One morning, Musou Daichi, a high school graduate and freelance worker, realizes that he has become a seeker. Seekers are people with unique abilities such as level, status, and skills.

Daichi bikes to a nearby dungeon and explores his first dungeon through trial and error. This is the story of a young man who gradually gains power while raising his level, acquiring skills, and cashing in the magical stones obtained by defeating monsters.

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The hearse with the weird odor slowed to a stop before the entrance. The sound of pebbles could be heard bouncing on the ceiling. There were footsteps coming from the corridor, and there seemed to be someone sawing next door. The door knob to the room rattled slightly, and the faucet in the bathroom kept dripping even though it had been screwed shut. There was a rubber ball that rolled on its own underneath the bed. Wet footsteps started to surface one after another on the floor.
At 3 am, Chen Ge held a cleaver in his hand as he hid beside the room heater. The call he was trying to make was finally answered. “Landlord, is this what you meant by ‘the house can be a little crowded at night’‽”

- Description from Novelupdates

Dr Dalton Wyatt, a world renowned Scientist and Inventor is transmigrated to the body of a high school student Dalton Wyatt who committed suicide due to unfortunate circumstances and complicated life.

Xuanyuan was reborn into a strange new world where training to be a Xian was a cornerstone. There was however something ancient dwelling inside his body. He could now devour all of creation…

This is the journey of an ordinary boy and his transformation into the supreme being that reigns over all existence! Everywhere he went, he could not help but tie his fate with numerous women. It did not matter whether they were a goddess or a devil…

- Description from Novelupdates