The animation is adapted from the first part of the Zhetian trilogy by Qidian platinum author Chen Dong. the hidden sky. Deep in the cold and dark universe, nine huge dragon corpses pull a bronze ancient coffin, eternal existence. This is an extremely shocking picture captured by the space probe in the withered universe. Nine dragons pulling a coffin—is it back in ancient times, or has it come to the other side of the stars? A vast world of immortal warriors, light, and mystery is endless. Hot blood like a volcano boiling, passion like a raging sea, desire like an abyss without end... ascending the road to heaven, stepping on the song, snapping your fingers to cover the sky

Source: Bangumi, translated

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Alternative setting: Wanmei Shijie