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As an immortal doctor of the Heavenly Court, Niu Xiaobao's marriage to a mortal girl was definitely a violation of the Heavenly Court's law.
So if it wasn't for Heavenly Queen doing her utmost to protect him, Niu Xiaobao would probably be caught and punished by the Heavenly King Li, so it wouldn't be possible for him to fulfill her long-cherished wish of marrying Liu Yue