Su He, a modern working woman, suffered from a "strange disease" that science cannot explain - her chest felt like an iron chain and she was in pain.
All the test results were normal, and the final clue pointed to a haunted house that she helped ventilate, and a clan of "Grey Fairies" that she accidentally saved in her childhood.
In order to solve this fatal entanglement, she entangled the descendant of the Gray Immortal who was handsome in appearance and powerful, but extremely afraid of trouble and just wanted to "cultivate immortality" in peace.
"It's love to save you, but it's my duty not to save you, do you understand?"
"But your affection is related to my fate!"
She was his inescapable debt, and he was her only medicine.
