The hero returns successfully from an undercover operation and is promoted by the police force to inspector. Thanks to his abilities and experience, his superiors decide to train a new group of hands-on officers, specially selecting several outstanding graduates from the police academy for intensive training. The hero is assigned as their instructor. The heroine, who graduated top of her class, is selected for the program. He admires her personality, though she has a weak sense of teamwork. He carefully analyzes each trainee's weaknesses and teaches them through practical exercises. He especially appreciates the heroine's decisive, resolute nature and believes she is well suited to undercover work. Before long, he develops feelings for her.
