Nine Nether Immortal Emperor

Three years ago, the arrogant family patriarch brought home a sickly young man, who became the family's live-in son-in-law. In the three years since, the whole kingdom has come to know him as a worthless son-in-law. But when the family decides to call off the marriage, they discover that their son-in-law is surrounded by a crowd of big shots, including emperors, magnates, and powerful experts, all addressing him as their teacher.