Cong Jintian Kaishi Yang Long

A man seeks to restore his family's reputation after his father was wrongfully accused, but lacks the magical ability to do so. After activating a mysterious Dragon Farming System, he suddenly gains powerful magical abilities. He is taken in as an apprentice by the empire's strongest mage, granted a noble title by the king, and betrothed to the princess. However, these sudden advantages come with unseen risks, and the system itself appears to be concealing a deeper secret.