Also known as Unknown
Before he knew it, Hyun Sung-min had turned forty. Looking around, he came to a stark realization—he was alone. Facing a crisis not only in his personal life but also at work, he resolves to struggle and fight in pursuit of true happiness.
30 Years Have Passed Since the Prologue 
A Corporate Underling Who Excels at Work 
A Dragonslayer’s Peerless Regression 
A Former S-rank Adventurer Who Was Betrayed By His Griends Because He Was Too Strong Wants to Live a Slow Life in The Countryside 
A Pig-Slaughtering Knife Cutting Through All Realms — Makes Sense, Right? 
A Rogue Guard in a Medieval Fantasy 
A Villain’s Will to Survive 
A Wimp’s Strategy Guide to Conquer the Tower 
A World Of Gold To You 
Absolute Regression 
Absolute Sword Sense 
Academic Supremacy Academia: The F‑Rank Supply Officer Reincarnates as the Legendary Greatest Mage