"Have you ever regretted loving someone..?" She loved him for 800 years. She was elegant, mesmerizing, and vivacious. She, who is called a seraph, was a devil in his eyes. He hated her for 800 years. He was powerful, wealthy, and arrogant. He, who is called a king, was actually a selfish and foolish man. This so-called "convenience marriage" was soon to be broken. A lamentable love story between star-crossed lovers, can it be overturned?