MTL - Honkai Q&A, Starting with Kiana - Chapter 191

A supreme expert in the Immortal World had died, and a strand of his soul returned to its original body on Earth. Tang Xiu discovered with amazement that ten thousand years passed in the Immortal World, yet only a single year passed on Earth.

Ruthlessly betrayed by his lover and trusted friends, Tang Xiu found that his soul went back to his previous body on Earth, and, despite he spent 10,000 years in the Immortal World, just a year has passed on Earth and many things have changed. Having an unsurpassed knowledge, Tang Xiu will protect his loved ones and go back to the Immortal World to take his revenge.

- Description from Novelupdates

Thousands of years ago, the great abilities of the three teachings of Buddhism, Daoism, and Demonism decided on a place for becoming immortal. Three thousand years ago, a Taoist was close to becoming immortal. Three hundred years ago, the Daqian Dynasty was established, and chaos is expected in another three hundred years. In this era, the path to immortality opens; a celestial swordsman freezes fourteen states with one sword, a heavenly Daoist maiden seeks eternal life, a naturally born Holy Son claims to be invincible, and a Buddhist Holy Monk saves all sentient beings.Gu Wen lives as a beggar, enters a household as a servant, witnessing the disordered world, drifting aimlessly.In a world filled with divine beings, he alone is a mortal.However, a lowly origin is not a disgrace; striving through the grand path, even as a common man and mundane son, he can still be the foremost in the world.“Mortal Gu Wen, my Dao is euqaling the heavens!”

Erwin Warner is a material-dominant alpha with a very unsteady financial background. Though he has the face of an angel, his personality is the polar opposite. He can even kill a person if there is enough money paid for that.Leo Snow is an exceptionally beautiful dominant omega. Even the gods envy his unparalleled beauty from the heavens. He has a very strong personality and is very picky about his partner. He can be as deadly as his face when the time comes.Jean Snow, a very unstandable uncle of Leo, has an unsubmissive greed for everything Leo has, that doesn’t exclude the Snow Groups and Company. Even being the blood brother of Leo’s father doesn’t change the fact that he is exceedingly obsessed with this pretty, small omega nephew of his.