The CEO's Cruel Test

To pay off his supposedly bankrupt girlfriend's debts, the protagonist and his mother work desperately. His mother even gives up her medical treatment to help with the debt. However, the protagonist then discovers his girlfriend is actually a billionaire CEO, and that everything was just a test for him and his family. Disheartened, he leaves town. When his girlfriend learns of his mother's death, she is consumed by regret and desperately tries to win him back.