If there is love, the demon and the immortal are separated only by a transparent curtain... If there is love, the immortal and the demon `are separated only by a fragile mirror... One is the sovereign of the demon world, possessing incredible boundless power, yet the ultimate power is no match for her pure and transparent smile...One is a girl transformed by the sound of a lute, possessing earth-shattering beauty, yet the most perfect looks are no match for his indifferent gaze beyond the world... The unresolved mystery from a thousand years ago causes him to willingly endure the pain of reincarnation, she faithfully accompanies him, only to help him regain his position as the demon lord. Two unparalleled men, one is an immortal, the other is a demon, both are captivated by her... However, she willingly turns into a wisp of smoke for the destined love of a thousand years, drifting out of the world..."