In this world, the Demon Realm and Yue Qilu have been at war for hundreds of years without a winner. Yue Qi Continent is divided into two domains: Yue Domain and Qi Domain. Legend has it that only the son of Princess Yue of the Moon Domain and Prince Qi of the Qi Domain can defeat the King of the Demon Domain. Yu Yang is the son of the Demon Realm. He sneaks into Yue Qilu to observe the situation and hopes to unlock a century-old secret, but he is accidentally involved in a crisis. Feng Xiaoxing was originally an ordinary girl from the Moon Domain, but she got an opportunity due to a disaster, but she never expected that there were amazing secrets and traps hidden behind it.