Seven Stars

On a rainy night, a female body engraved with the word "Tianshu" and a silver five-pointed star pendant reappeared, triggering the bloody memory of Shen Xingci, the leader of the city's criminal investigation detachment, of the "Beidou" unsolved case three years ago - when his partner died to protect him, leaving only a Beidou star keychain. The parachute landing of criminal psychology expert Lu Shiyan broke Shen Xingci's solitary state. This man who always carries a hand-drawn starry sky notebook not only asserts that the murderer is seeking revenge in the order of the Big Dipper, but also involves a secret that neither of them has revealed: Shen Xingci's partner who died was once the protective policeman in the case of Lu Shiyan's sister; and the clue that Lu Shiyan's sister was silenced was actually half of the Beidou fragment that can be combined with Shen Xingci's keychain to form a complete Beidou. Victims appear one after another, and the signs of "Tianxuan", "Tianji", "Tianquan" and "Yuheng" are closing in step by step, pointing to an unsolved illegal fund-raising case three years ago. When Lin Shen, the murderer who imitated the crime, appeared wearing a Beidou mask and revealed the "ghost" who protected the mastermind in the old case, Shen Xingci's obsession and Lu Shiyan's hidden pain finally converged. The two went from being on guard to working side by side, solving layers of puzzles on the road to chasing the murderer, using reasoning and psychological games to tear apart the darkness. In the end, not only was the real murderer and the mastermind of the old case brought to justice, but the Beidou made of two keychains, together with the seven connected stars on the notebook, became the light that illuminated each other's past and anchored the future. Purpose: 1. Persistence and pursuit of justice: Even if old cases are dusted and the truth is covered with dust, criminal police and psychological experts are still pursuing the murderers with persistence, exposing the hidden crimes, and interpreting justice may be late but will never be absent. 2. Trauma and redemption: Using the Beidou case as a link, the two people who bear the pain of the past face their obsessions and release their shackles while chasing the murderer side by side, and ultimately become the light of redemption for each other out of the darkness. 3. The complexity and warmth of human nature: It not only shows the extremes of criminals caused by tragedy, but also depicts the protagonist's struggle between duty and emotion, conveying the softness and strength of human nature in the cold criminal investigation.