Who is female forensic jd Gao Yongtai?

Gao Yongtai is a spy inside the police station. The reason why the inverted cross case can be solved and Song Lihong can be cleared of suspicion is actually because of Lin Xiaomei. It was Lin Xiaomei who sent these evils to Liu Zhiming bit by bit. Gao Yongtai was a spy in the police station and killed the man who kidnapped Song.