The whole story begins with an encounter between an angel and a black angel hundreds of years ago. They had a child, who was imprisoned in a tower at the end of the corridor of hell for a hundred years. When he finally broke through the shackles of the tower and came to the world, the shackles of the tower gave him a sad understanding of the world. He belonged to the darkness, and inherited his mother's power in a unique way. He fell into darkness forever and reincarnated forever, because he is the bloodline of the Gray Angel cursed by the Wings of Death! As his fate continued to turn, he met Aixia, the ruler of Death's most prestigious family. They love each other, but they cannot say it out. Everything has become their bond. Their love that can never be said out, and whose control is it? The complicated relationship, betrayal and injury. Is this a fairy tale, or is it a cruel fairy tale? In the end, after experiencing so much, can I say that I love you! ...