When you go from level 99 to level 1 and start all over again. 
(Source: WEBTOONS)
 
Note: Chapter count includes epilogue.

I’m... back! After a comet collides on Earth, a gaming world filled with monsters and dungeons becomes a reality. Amidst the chaos, Won-Ho wakes up as Hardcore Leveling Warrior, an almighty game character with exceptional luck and power. Once again, he will embark on a journey to become the strongest... but this time, on Earth! 
 
(Source: WEBTOONS, edited)

I logged into a viral virtual reality game and was given... a weird shovel. It can create anything, but monsters only attack me. After smashing everything with the shovel, strange people started to appear! Who will win? Let's find out in a fight! A crossover between the +99 Reinforced Wooden Stick and Hardcore Leveling Warrior universes! (Source: Naver, translated)

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