In the Apocalypse, I Was Adopted by the Most Powerful Chaebol Boss

This is a wasteland epic. It's about the awakening of a low-level boy, about the intrigues and wars between consortiums, about a girl's obsession with remembering one word in twelve years, about the secrets carried by each of the S-class strong men, and about the most extraordinary protection that a pair of ordinary parents can give their children in troubled times. "Kui, the first star of the Big Dipper. It's not big, but it's at the front."