Preserve the Royal Ancestral Shrine and the State

Introduction to the Work: [The Emperor and Empress have passed away... Private jet crashes over Brazil Jinma (Demon-Suppressing) Barrier stability at 68%... Military considering DEFCON 3] The Emperor, the guardian of the Jinma Barrier that protects the Republic of Korea, is dead. But with a reliable Omega Crown Prince, there shouldn't be any problems, right? Jung Ha-yul, an ordinary college student, thought as much, but— “Please ascend to the throne to stabilize the shaking Jinma Barrier as soon as possible, and produce an heir to preserve the royal ancestral shrine and the state of this nation.” I was the Emperor's hidden child? You want me to become the Emperor and produce an heir?...