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Twelve years ago, as the U-20 virus spread around the world, the whole world was in an uproar. However, due to the appearance of zombies infected with the virus, Hee-won is bitten instead by zombies that were running towards Woo-jun, and symptoms of fever and hives begin to appear... "I'm scared, Woo-jun. Can you please kill me?" "How can I do that, to someone so kind-hearted..." Woo-jun is shocked to see Hee-won disappear rights in front of hi eyes with a loud explosion. A few years later, Hee-won, whom he thought was dead, appears in front of him in the same appearance, confusing Woo-jun... "Who are you?" "I am Chae Hee-won, the guide that is in charge of Captain Kang Woo-jun this time".
A decade ago, Captain Woojun Kang, an S-tier Esper, saw “Doc” sacrifice himself to save him—no doubt about it. He never even learned Doc’s name. Fast-forward to now, Woojun’s staring down his new S-Tier Guide, Huiwon Chae, who’s a dead ringer for the man he thought was gone. Huiwon draws a complete blank on Captain Kang. Their paths haven’t crossed... or so he thinks. As far as he knows, he was out two months due to an accident. Will they connect the dots, or will this second chance slip away?