Leveling Up Alone. Solo Leveling. Book 1

"ASCENSION OF THE WEAKEST MONSTER HUNTER!
The world has changed. Gates connecting reality to a parallel dimension have opened everywhere. Some people have gained superpowers and become monster hunters that lurk in dungeons and threaten humanity.
Sung Jin-Woo — the weakest and unluckiest E-rank hunter, lacking both wealth and special talents. One fateful day, he and a group of hunters entered a hidden double dungeon and encountered terrifying monsters that no one had seen before.
Just before his death, he heard a strange sound and a mysterious female voice…
Ding!
[Congratulations, you have become a Player.]"