Solo Leveling episode 9 showcased Sung Jin-Woo facing off against Kang Taeshik, a maniacal killer. This battle, following the Cerberus fight, highlighted Jin-Woo's growth as he gained a new ability. The anime adaptation by A-1 Pictures differed slightly from the source material, particularly in the interactions between characters. One significant change was Jin-Woo receiving a new skill from Kang Taeshik in the form of a rune stone. Additionally, the anime omitted a scene where Jin-Woo shows a new level of ruthlessness by allowing Magic Beasts to rip apart a convict in the manhwa.

The anime also avoided introducing a new character, Woo Jinchul, and potential story arc. Overall, these alterations hint at Jin-Woo's evolving understanding of the System and showcase his increasing strength in combat.