Five years ago, young detective Lu Chenzhou was coerced by the evil forces and personally classified a murder case as an accident. Since then, he has been burdened with guilt for half his life. He took off his police uniform and opened a "Guizhou Bookstore", hiding in the city.
Five years later, Lin Nian'an, the sister of the victim Lin Wanxing, came to the door. A black onyx button with the word "" engraved on it revealed the shocking lies that had been covered up that year.
The evil forces are rampant and their protective umbrella is deeply rooted. Behind the murder case that has been sealed for five years, lies the heinous evidence of Zhenbang Chemical's smuggling of highly toxic substances, illegal sewage discharge, and bribery of officials.
In order to redress the injustice and redeem himself, Lu Chenzhou rekindled his true nature as a criminal policeman and joined forces with Lin Nian'an to tear apart the disguise of the evil forces step by step, starting with a button, and uncover the real culprit behind the scenes. Justice will be delayed but will never be absent!
