After I crossed into the book, I stole the protagonist's master Bai Yueguang

Liu Yishu was struck by a bolt of lightning and entered the world of the novel he had just finished reading. A book-traveling system inexplicably appeared in his mind. The small system forced him to issue a task to save the relatives and friends of the protagonist Tiansha Guxing, and threatened to kill them if he failed to complete the task! Who is trembling when the newborn little beast cub faces the ancient and notorious monster? Who is showing off? It is impossible, because Liu Yishu found that the first task object he needed to save, the protagonist's master Bai Yueguang who died at the beginning, was actually his enemy and creditor from ten thousand years ago - the kind of debt that was so much that even his life was not enough to pay it off! Taking advantage of the other party's memory loss, he decisively chose...