I Am a Vicious Master, Why Did My Apprentice Go Crazy After I Escaped from Death?

Two male protagonists/death escape/chasing wife/master and apprentice/younger Shen Guqing traveled through time and became Mo Lixianzun in the world of immortality, and at the same time bound the system. The system assigned him a task to train the son of destiny, his disciple Jiang Buchen. After the task was successful, he could return to the real world. However, his life in the real world was too miserable. In order not to return to the real world, he deliberately treated Jiang Buchen in every possible way. Unexpectedly, Jiang Buchen not only did not hate him, but even pestered him affectionately and called him master. Until that battle between gods and demons, something unexpected happened, and Jiang Buchen blocked a fatal blow to protect him. Since then, his spiritual roots were completely destroyed, his legs were broken, and he was reduced from a proud man to a useless person. The huge blow made the former little sun become more and more decadent. He went on a hunger strike and sought death. He even hated him because of it. When he saw him, he would call him a hypocrite and tell him to get out. Seeing this, Shen Guqing, who had always been selfish, felt guilty. In order to restore his disciple's foundation, he searched all over the world for a way to repair it. Finally, he learned from other elders that there was a treasure in the forbidden area that could rebuild the spiritual root, but it was guarded by a vicious monster, and he had a narrow escape. So, he broke into the forbidden area alone without telling Jiang Buchen, but died tragically at the hands of the monster. After learning that his master died in order to restore his foundation, Jiang Buchen broke down and cried bitterly in front of his tomb, feeling extremely regretful. "Master, my disciple is wrong. I will never blame you again..." Unexpectedly, three hundred years later, Shen Guqing was reborn due to a system accident. [Congratulations to the host for completing the task of cultivating the Son of Destiny! It is detected that the host is unwilling to return to reality, and the host is given a reward to be reborn and stay in the world of immortality forever! Shen Guqing was stunned on the spot. The mission was... Completed?