Reborn: I Became the Overlord of Jiuzhou

What Ling Yun regretted most in his life was trusting the Ling family too much. They double-crossed him, and in the end he died without even leaving a body behind. Reborn into a new body, he returned to the Ling family under the identity of the young Ling Cang. His wish was simple: bring the Ling family to ruin. But why had the disciple he picked up along the way started acting so strangely? Could it be that he had taken on a fake disciple? Note: This is a master-disciple story with the disciple as the protagonist in the receiving role. It's a feel-good story with a golden finger. Reborn, darkened protagonist in the receiving role x scheming, loyal-dog protagonist in the giving role. The author is an idiot with muddled thoughts and no clear logic. Please spare me, logic fans. Theme: