Yeon-woo's twin brother disappeared five years ago, only for his pocket watch to suddenly fall into Yeon-woo's hands. Inside, Yeon-woo found a hidden message: "By the time you hear this, I will already be dead..."
His brother, a talented genius, had been betrayed while climbing Obelisk, the Tower of the Sun God, a world where several universes and dimensions intersect. After learning the truth, Yeon-woo sets out on a quest for vengeance – he faces off against a Tower almost like a world unto itself, filled with dangerous factions, jealous rivals, and ancient plots.
But he has a secret advantage: the pocket watch has stored the memories from his brother’s climb, with all the recollections of meeting extinct species and secret treasures. Will it be enough to defeat his brother’s enemies to reach the top of the tower?