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The music played by Mary's music box floats in the sky, which can soothe people's hearts and make them gentle and strong. According to legend, this is a gift from God. Therefore, there will be no turmoil in the hundreds of lands in the world embraced by Mary, and everyone will be gentle and free from disputes. However, will human beings who have lost the negative emotions of hatred, jealousy, greed, and arrogance achieve true happiness? What price will mankind pay for peace? Behind the sad love song, will the chosen boy Kay lead mankind to the welfare or destruction of mankind? In a paradise without disputes, we are like caged birds, enjoying cruel and tender love.