The meeting of the two seemed like a coincidence but not like a coincidence. You came and scratched a shallow mark on my heart. I thought it would heal quickly, but unexpectedly it would become inflamed and ulcerated, painful and itchy, dragging me into the abyss in your name, leaving a deep scar, which is the evidence of my love for you. This article takes the detection of criminal investigation cases as the main line and revolves around the love-hate relationship between the captain of the criminal investigation team Lu Zhiyun and the forensic doctor Wu Jin. In the process of investigating various cases, the two met, got to know each other, and fell in love with each other but faced many difficulties. Friendship? Family affection? Promise? Betray? The clues in a series of cases point directly to the mastermind behind the scenes, but the real results are unexpected. How to choose, and where should they go?