Lu Qing, the second disciple of the Honglin Sect, had advanced cultivation, so his master Honglin Gong often asked Lu Qing to go to the mountains to slay demons and eliminate demons, and asked Jiang Shuang to follow him for training. One day, Honglin Gong left a letter and suddenly left. When he opened the Honglin Sect, the letter read, "I am about to die, let Lu Qing be the leader." After that, Lu Qing's senior sister Yao Xiahui claimed that she went down the mountain for a walk, but she was never seen again after that day. A few years later, Hong Lingong and Yao Xiahui suddenly came back. What was their plot behind their return?
Intention: Guess