The sound of the piano is whistling, the joys and sorrows of separation and reunion are endless, the light of swords and shadows are lingering in the soul. Destiny, how ridiculous, but you have to believe that some things are not in your own hands. When Kai Yuanxi's life is intertwined with endless darkness and hatred, what will be the outcome? Everything in the world is in the hands of three teenagers. What makes the teenager shoulder such a heavy responsibility? What makes the teenager pick up the weapons in his hands and start killing? When youth is stained with blood, can everything go back to the beginning? The longing that the prince's long harp cannot play lingers in my heart, bit by bit, piercing the softest part of my heart. Can a heart soaked in blood become strong and immune to all poisons? In the darkness, everything returned to calm, but who knew what was hidden behind this calm? When the dark clouds disperse and the sun fills the sky, who is singing quietly beside you, and whose pale eyebrows inadvertently reveal sadness. When the bleak autumn wind comes from the depths of summer, do you still remember who deceived you in midsummer? When the past fades away like a dream, when you finally return to your own world, you still remember the time when we fought side by side so many years ago.