Level Up with Skills

In a world on the brink of collapse, humanity relies on a mysterious tower that offers four difficulty modes: easy, normal, hard, and the unforgiving “alone mode.”
Kang Taesan initially chooses the easiest path and still manages to become the tower’s most skilled conqueror.
However, as the apocalypse draws closer, he realizes his strength is still insufficient to save Earth.
In response, he turns back time and deliberately selects “alone mode,” the most punishing path available, to push himself further.
Given a second chance, Taesan sets out to gather overwhelming power before the end of the world arrives.