My Puppy-Dog Prince Is So Fierce

Everyone in the capital knows that Li Yu saved Su Lige’s life, so it’s only natural for her, a favorite at court, to chase after the prince exiled a thousand miles away and repay him. But he was such a sweet, gentle little puppy when he was young. How did he grow up to be so fierce? His elder sister is disguised as a man. Should she reveal her secret identity or not?