Korean TV: Touring a Thousand Worlds, Starting with All of Us Are Dead

[Not a transmigration story! No System!] [This is a happy ending, not a tragic one] [K-drama worlds + the original protagonists' combat squad!] [Shows featured: Train to Busan! Happiness! Kingdom!] Han Jun! For certain reasons, he disappeared for five years. Then, at last, he returned to his own world, only to find a horde of zombies waiting for him! And his spirit armor was unusable! With help from the original protagonist group, they managed to escape the school! In the end, he formed his own combat squad! Together, they journey across the worlds, reaching the very top!