The Secret to Becoming the Richest Man: I Spare No Expense on My Wife

After dying unexpectedly, Shen Chen wakes up in a parallel world, where he transmigrates and becomes bound to the Devoted Husband System. As long as he spends money on his wife, he gets double the amount back. Shen Chen goes on a spending spree for his wife and, before he knows it, becomes the richest man in the world. When someone asks how he became a billionaire, Shen Chen sighs and says, "I just don't mind spending money on my wife."

This novel has one female lead.