All-around protagonist mentor

The vast Five Realms and the boundless Four Seas. After a thousand years of peace, undercurrents are stirring. Ambitious sects from all sides, alien races from beyond the heavens who refuse to remain dormant, survivors of the ancient era... Qing Xuan, after some calculations, discovers that a great era of dragons and snakes rising together, of fierce competition, is about to begin. A surge of joy fills his heart. He stretches and steps out of the small mountain village where he's been holed up for ten years. "It's time for me to emerge from seclusion and make this world even more exciting!" PS: I am Qing Xuan, recruiting students year-round, specializing in teaching all kinds of unparalleled martial arts techniques. I guarantee you'll become a rich, handsome, and successful man, win the heart of a beautiful and wealthy woman, and reach the pinnacle of life! Tuition is cheap, just one meal is enough!