It was a novel about saving an old man overseas. The old man married his granddaughter to him. The old man's granddaughter was called the business sister. The novel was called Soldier King

It was a novel about an old man who was rescued overseas. The old man married his granddaughter to him. The old man's granddaughter was called the business sister. The novel was called Soldier King. In the first chapter, the protagonist returned and raced with a rich playboy. However, his car was damaged by the rich playboy. Later, he robbed one of their cars and saved a girl. This girl and the heroine were called the business sister.