Solo Leveling season 2 : Side Story 
After receiving the power of the “Shadow Monarch”, Sung JinWoo started his journey to become the strongest Hunter by defeating various enemies.
Sung JinWoo decided to go back in time after winning his last battle against “Antares the Monarch of Destruction and the King of all Dragons.”
He returned to a world where no “Gate” had ever appeared and no humans had received the power of a “Ruler”. Even so, Sung JinWoo still has his abilities as the new Shadow Monarch, Sung JinWoo’s new journey begins now.
Synopsis : Solo Leveling season 01

10 years ago, after “the Gate” that connected the real world with the monster world opened, some of the ordinary, everyday people received the power to hunt monsters within the Gate. They are known as “Hunters”. However, not all Hunters are powerful. My name is Sung Jin-Woo, an E-rank Hunter. I’m someone who has to risk his life in the lowliest of dungeons, the “World’s Weakest”. Having no skills whatsoever to display, I barely earned the required money by fighting in low-leveled dungeons… at least until I found a hidden dungeon with the hardest difficulty within the D-rank dungeons! In the end, as I was accepting death, I suddenly received a strange power, a quest log that only I could see, a secret to leveling up that only I know about! If I trained in accordance with my quests and hunted monsters, my level would rise. Changing from the weakest Hunter to the strongest S-rank Hunter!

Only I Level Up , Поднятие уровня в одиночку , 나 혼자만 레벨업 , 俺だけレベルアップな件 , 我獨自升級 , Na Honjaman Lebel-eob