After I Came Back, My Apprentice Became My Master.

(Two male protagonists, two male protagonists! No female protagonist) [Main Attack + Double Cleansing + System] Jiang Yu felt that although he was not a good person and was a bit obsessed with money, he had never done anything harmful to nature, so why did he wear the same book twice. The first time he passed through it, he became Master Ling Yan and led his disciple to the pinnacle of life. Complete the mission and return to the original world. The second time the system said there was a problem with task completion, so I went in again. As a result, the system made me Ling Yan's apprentice. Why did I become Ling Yan's apprentice? I shouldn't be given another identity. Scholars can be killed and cannot be humiliated. The system says that only by completing tasks can you get rewards. So I thought it was not impossible to get a reward, so I wore it again.