Solomon's tattoo hobbyist Lan Shu'er suddenly captured a naked female corpse with a flirtatious tattoo on her back in the lens, and the deceased was actually her best friend Sui You. When the police launched an investigation into the murder, everyone began to deny that Sui You had ever existed. Was "Sui You's disappearance" a collective loss of memory? Or was it a case of mild neurosis in which Lan Su'er was hallucinating? What was even more frightening was that Lan Su'er found that her remaining memories of Sui You were beginning to slip away from her mind little by little...