Seven years ago, the criminal investigation legend Lu Chenzhou used the cruelest "betrayal" to push the forensic newcomer Su Wan away in order to protect her. Seven years later, she parachuted in as a top forensic scientist and became his only partner in solving serial murders. At the crime scene, she was calm and professional, treating him like a stranger; while chasing the murderer, he suffered from regret and love burning his heart. When the mystery of the old case intertwined with the murderous intent of the new case, Lu Chenzhou had to embark on the crematorium of chasing his wife seven years later on the verge of life and death. Truth or sincerity, which one is more difficult to redeem?