Lewd words and delicate scholar bottom & Reserved and silent, but still waters run deep, fox top

After she'd fled, she'd spent the night with a strange man and fallen into the hands of the demons. She left the check and went away, and when she saw him again, he was the man she could never hope to reach. "Woman, you want to run after seducing me?" He pushed her against the wall. "Who's gone? I'll give you whatever you want, okay?" "Are you sure you can satisfy anything I want?" The man's eyes were deep. Later she learned that he wanted her heart.

Each case is related to something special. Every trace breaks off somewhere without giving the detectives any logical solution. Everyone is different and understands the concept of serial killing differently. Some only catch evidence, others are intuitive and accurate. There is one case and there are countless detectives. What will each of them have to go through to get to the very end of the serial murder path? Will any of them find a solution?