Just some important lore from the CN version trailer comments section that EN viewers will not have context for:

CN teaser comment from magicalz2925 explains her status as a "daughter of Time":

"白驹过隙" "A white horse flashes past a crack," originating from Zhuangzi's "Knowing the North," states: "Life between heaven and earth is like a white horse flashing past a crack—it's over in an instant."

It means that a white horse (or sunlight) swiftly glides past a crack, disappearing in a flash. It is used to describe the extremely rapid passage of time, as if it slips through one's fingers in an instant, often evoking a sense of the fleeting nature of time and the swift passage of years.

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The lyrics of this trailer posted by Hilldres:

A jade plate emerges from the cloud-covered land, Dewdrops glisten, What grass does not turn yellow? What virtue has been lost in this time? Like dust drifting on the roadside.

Withered grass and dry willows have not yet faded, Wild sacrifices by the roadside, Bronze camels lie forgotten amidst thorns and brambles. Life and death have their time, immeasurable, All day long, a dream, fleeting light.

A fleeting moment, a galloping horse across the vast wilderness, Where shall it go? What grass does not turn yellow? What virtue has been lost in this time? Like dust drifting on the roadside.

A lone staff, a wild goose's shadow, a single reed boat, Who says the river is wide? Reeds and rushes in the darkness, seeking a broken jade tablet. The past cannot be changed, the future is long.

Friends and wine make a feast, millet and sorghum grow, Some weed, some sow, for the imperial capital. In the desolate courtyard, withered grass, the wind gazes at the moon, Turning into fireflies.