The Meteoric Rise of a Super Tycoon

The man his wife's family calls a freeloading son-in-law is the heir to a conglomerate. His father hid who he was for years and let the son work as a driver so he would get his training out in the world before the company came to him. He works day and night to give his family a better life, and his wife's relatives go on calling him poor and hopeless. He stops for a woman who has collapsed while he is out on a delivery run and helps her, and his father had arranged that as a test. The wife's family holds a birthday party on the same date as the company's anniversary, and his wife asks him for a divorce in front of the guests, who treat him as a write-off. His father had come to the party to say who he was and walks in on the divorce demand. Rivals of his father are already moving to take control of the company, and the two identities come out in the middle of that.