Training Tai Sui

Later generations said that Emperor Yang Guang of the Sui Dynasty was a faint emperor rarely seen in the ages, and thus was replaced by the prosperous Tang Dynasty.
As a time traveler, Qin Feng originally wanted to fight cocks, walk with dogs, teach a few disciples, let them work hard to climb up, so as to become his backer.
But who knew that the disciple turned out to be...