Under the bustling surface of modern cities, there is a mysterious world of cultivators. Qi Yan, a thousand-year-old monk, is hiding in the world as the founder of the "Extension Group", and is searching for the remnant souls of Taoists who disappeared in the sea of the past. Su Wanwan, an architecture student, had no choice but to sneak into the Life Extension Group to steal secrets due to her father's gambling debts, and she became involved in a fateful entanglement that spanned a thousand years.
Su Wanwan mistakenly touched the seven-star natal chart and awakened the ice soul hairpin collected by Qi Yan. The residual thoughts in the hairpin guided her to draw the structure diagram of Qi Yan's cave nine hundred years ago, which attracted Qi Yan's attention. Qi Yan transferred Su Wanwan to his side through project cooperation and found that she had an amazing talent for restoring ancient buildings and often sang the Requiem for the Tribulation without realizing it. As they got along, Su Wanwan began to dream about being pierced by thunder. Every time Qi Yan suppressed her memory, the red rope around her wrists cut into her flesh and blood.
It turns out that the debt collection gang is actually a cultivator traitor who covets the secret of immortality. They kidnapped Su Wanwan and forced them to question Qi Yan about his weaknesses. During the fight, Su Wanwan was shot in the heart. Qi Yan used his life magic weapon to save his life, but it was revealed that nine hundred years ago, Su Wanwan endured the ninth level of thunder calamity on his behalf. The leader of the traitor turned out to be Junior Brother Qi Yan, who used the soul-binding lantern to destroy Su Wanwan's soul. At the critical moment, Qi Yan burned thousands of years of cultivation to reverse his life chart, but Su Wanwan took the ice soul hairpin and stabbed it into her heart, leaving the words "I will protect you this time".
