This is a polyamorous romance. If that's not your thing, please don't read.
Humans are a species from Earth. In an age of rapid technological advancement, they ventured into space, only to discover that the galaxy showed no trace of life. So they established the Galactic Empire.
On the day they unified the galaxy, the Heavenly Dao proclaimed the existence of humanity, but that proclamation also alerted the other races of the universe.
The myriad races learned of humanity and the fertile lands of the galaxy, and so they invaded.
Humanity, acknowledged by Heaven and Earth, awakened guardian spirits.
Technology and cultivation advanced together to repel the invasion of the myriad races.
After ten thousand years of struggle, humanity secured the galaxy and began an endless plunder of resources in the adjoining lands of Shentian.