Five years ago, detective Su Ying was forced to marry Lin Chuan, a taciturn delivery boy. She thought it was a banal make-or-break. Later, she discovered that the real codename of the man she had disliked for five years was "Zero." The man who was once selected as the core operator of humanity's ultimate defense line, but disappeared with the fragments of the protocol before the final test. Nowadays, the old troops remain and are pursued by troops from all directions. Holding the "key" he left behind, she went deep into the underground maze, but accidentally activated the anchor point of the "Cornerstone" agreement that had been dusty for twenty years. What is sealed there is not only his broken memories, but also the source of the "sky" - the indescribable ancient gaze from beyond the stars.
