I Want a Wife, a Marriage, and a Female Bodyguard!

<Time travel, no cheats, no system, just fun> Chi Yin broke into the inside story of a pharmaceutical company and obtained evidence. He was chased by a killer and jumped off a cliff. However, he accidentally time traveled to the body of his adopted son-in-law with the same name. He took care of himself as soon as he came. Let's see how Chi Yin makes this son-in-law's path more and more open. He conquered the princess, teased the female bodyguard, killed the traitor, accumulated wealth and retired...