Beneath the dazzling facade of the modern city lies the mysterious world of cultivators. The thousand-year-old cultivator Qi Yan has hidden among mortals as the founder of Longevity Group, desperately searching for the remnant soul of his Dao companion, lost in the Sea of Rebirth. Su Wanwan, an architecture student whose father is drowning in gambling debts, has no choice but to break into Longevity Group to steal confidential information. She is soon drawn into a fateful entanglement spanning a thousand years.
Su Wanwan accidentally activates the Seven-Star Fate Chart and awakens the Ice Soul Hairpin treasured by Qi Yan. Guided by the lingering thought within the hairpin, she draws a floor plan of Qi Yan’s cave abode from nine hundred years ago, catching his attention. Using a project partnership as an excuse, Qi Yan brings Su Wanwan to work by his side. He discovers that she has an extraordinary talent for restoring ancient architecture and often hums a requiem for surviving tribulation without realizing it. As they grow closer, Su Wanwan begins dreaming of being pierced by heavenly lightning. Every time Qi Yan suppresses her memories, the red cord around his wrist digs deeper into his flesh.
It turns out the debt collectors are renegade cultivators coveting the secret art of immortality. They kidnap Su Wanwan to force Qi Yan to reveal his weakness. During the struggle, Su Wanwan is shot in the heart. Qi Yan uses his life-bound treasure to keep her alive, but this awakens the truth: nine hundred years ago, Su Wanwan took nine rounds of heavenly tribulation for him, and the Heavenly Dao cursed her: “After seven cycles of reincarnation, her soul will scatter.” The leader of the renegades turns out to be Qi Yan’s junior fellow disciple. He brings out a soul-binding lantern to destroy Su Wanwan’s primordial spirit. At the crucial moment, Qi Yan burns a thousand years of cultivation to reverse the fate chart. But Su Wanwan snatches the Ice Soul Hairpin and drives it into her own heart, leaving him with the words, “This time, let me protect you.”
