Honghuang: Disciple of Taiqing Gate

Xuandu traveled across the prehistoric times and became the only direct disciple of Taiqing Laozi. Three days after I started, I read a book on elixirs, fanned the stove with a flame flag off the ground, and refined a dozen high-grade golden elixirs in one furnace! Fairy Bixiao who was passing by was dumbfounded on the spot - what is the origin of this mortal whom Master Taiqing accepted?