"Detective Conan" by Ke Ai and Xinzhi
He was carefree at that time, she was content with herself at that time, and they were so alien to each other at that time.
He is a well-known young detective. She is an unknown genius chemist.
Their encounter is like a fairy tale, full of mystery and requiring constant vigilance. But they will answer you without hesitation that they do not regret having such an encounter and experience.