The Whole World Ships My Secret Identities

When Mu Yun Zhao woke from a deep sleep, the pavilions and towers of old had become skyscrapers, and sword-flying had given way to airborne cars... Before he could figure out what was going on, he discovered that even after millions of years, legends about him still endured on this continent. The details seemed a little off, though. CP fan 1: I heard the Immortal Realm's greatest battle god and the Demon Realm's lord loved and fought each other. Mu Yun Zhao (coldly): Oh. CP fan 2: I heard Emperor Mu Zhao never married because he admired the Demon King. What a shame they were born in different eras. Mu Yun Zhao (coldly): Oh. CP fan 3: I heard the Spirit Realm princess and the sword spirit Yun Mu are a couple. Mu Yun Zhao (coldly): Oh. Then he saw two men on a gigantic screen, locked in an embrace as they fought, while a line of text slowly appeared: "A Love That Shook the World: The Immortal-Demon Chronicle, coming soon." Former Celestial Realm battle god/Demon Realm lord/human emperor/demon king/princess/sword spirit, now unemployed and undocumented, Mu Yun Zhao: Wake up! Those are all my secret identities!! *No CP, light novel* *The Spirit Realm princess is male* Theme: Time passes, friendship endures.