Ditty of life

Detective Xinjiang Wu is a new man in this job. On his first case, he noticed a girl with grey eyes following him wherever he goes for investigation. He get to know this girl, she can be the next clue or a suspect. For some unknown unearthly reasons, she is the first person who carries a song from a distant nightingale whenever she is with him, it's with them. He had no idea where the case was going or the song carrier girl be the suspect but it has it's end that's for sure.