Igris is one of the first Shadows that Sung Jin-Woo acquired. He was initially protecting an empty throne in an Instant Dungeon where Jin-Woo was doing his Job Quest in the Job Change Quest Dungeon.

After two failed attempts of Shadow Extraction, Sung Jin-Woo convinced him to protect him instead of protecting an Empty throne, obtaining him as a Knight Grade Shadow.

In a world where awakened beings called “Hunters” must battle deadly monsters to protect humanity, Seong Jin-U, nicknamed “the weakest hunter of all mankind,” finds himself in a constant struggle for survival. One day, after a brutal encounter in an overpowered dungeon wipes out his party and threatens to end his life, a mysterious System chooses him as its sole player: Jin-U has been granted the rare opportunity to level up his abilities, possibly beyond any known limits. Follow Jin-U’s journey as he takes on ever-stronger enemies, both human and monster, to discover the secrets deep within the dungeons and the ultimate extent of his powers.
 
(Source: Tappytoon)
 
Note: Chapter count includes a prologue and 21 side stories.

They say whatever doesn’t kill you makes you stronger, but that’s not the case for the world’s weakest hunter Seong Jin-U. After being brutally slaughtered by monsters in a high-ranking dungeon, Jin-U came back with the System, a program only he could see, that’s leveling him up in every way. Now, he’s inspired to discover the secrets behind his powers and the dungeon that spawned them. 
 
(Source: Crunchyroll)

The second season of Solo Leveling. 
Mastering his new abilities in secret, Jin-U must battle humanity's toughest foes to save his mother. 

(Source: Crunchyroll News)