City; Retired Emperor

The world's largest underground organization suffered a devastating disaster, and the entire organization was in danger. The genius boy of the past had no choice but to compromise with his opponent for the sake of his loved ones when facing danger. The price was to put away his sword and retire and stop fighting. Just when he wanted to experience ordinary city life, a bigger conspiracy surfaced. The truth about the mysterious death of his master, his mysterious life experience, the remnants of ancient civilization... There are hidden connections between many seemingly unrelated events. In this case, let's fight again! This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.