Shen Yanzhou used his pre-marital savings to run a coffee shop, but his wife's younger brother brought relatives and friends to the store to consume for three consecutive months, accumulating an unpaid debt of 800,000 yuan without ever being willing to pay the bill. The younger brother took it for granted that his brother-in-law's money should be used for his own squandering, and his wife blindly favored her own family member. Facing his family's unreasonable demands, Shen Yanzhou adhered to his principles and bravely clarified the economic boundaries. The story tells us that in marriage, one must distinguish right from wrong, hold the bottom line, and refuse excessive demands.