Baek Beom has worked as a forensic doctor for 10 years, he is excellent with his work, but does not open his mind to other people. Eun Sol is a rookie prosecutor with a bright personality and she comes from a wealthy family. The forensic scientist with a bad personality and a warm-heart ed prosecutor must join forces in order to catch a serial killer. In crime and in life, all contact leaves a trace. There is no perfect crime and our hero and heroine have the ultimate cooperation. This drama continues the tale of a forensic scientist and a prosecutor who make the best of teams.