Feng Shui Master, Peace and Comfort

"Officer Li, can you keep this matter a secret for me?"Noah Zhao Erhu asked uneasily.
Officer Li nodded and said, "Don't worry, I won't tell anyone."
"Thank you!"Noah Zhao smiled.
Viola Li expression changed, and she immediately asked, "By the way, I have another thing I want to ask you."
"What's up?"
"Since you are so capable, why couldn't you find any clues when you helped me solve the case before?"Viola Li said.
Noah Zhao scratched his head: "I don't know everything."
actually.
He...