Cake shop owner Lin Xiaoman is always mistaken for a cute girl who needs to be protected. She speaks softly with butter on her apron, but she can identify clues at the murder scene that is a headache for the police with the precision of a decorating bag - while others are shocked by the bloody scene, she is squatting in the corner to study the frosting ingredients in the fingernails of the deceased: "This is the milky fragrance of French Isny butter. The murderer may be a contestant in the dessert competition next door." When the detective captain took her with him as a mascot, she used a fondant doll to restore the micro-expression of the deceased before he was attacked, and used a baking thermometer to measure the true time of death of the corpse. The sweetest and coldest crime truth in the city is hidden in the detective notes filled with the aroma of cream.