1. In the psychological crime, Liao Yafan was finally strangled alive by Jiang Ya in the utility room of the hospital.

2. Liao Yafan is in the reformatory. Later, after she got on the train herself, no one knew where she went.

Liao Yafan didn't appear in Underground River, but Fang Mu has been looking for her, but there is no news. She said that she will definitely come back in the future.

4. Mi Nan has nothing to do with Liao Yafan. They are not the same person. In Underground River, the last "you" should refer to Mi Nan.

About Liao Yafan:

This little girl was adopted by the detective Fang Mu in the movie (or TV series). Her name is Liao Yafan. She used to be the protagonist of the rape of a young girl investigated by Fang Mu. Later, Fang Mu adopted her because her father was mercenary. She lived with Fang Mu all the time and was infatuated with Fang Mu, but she was finally killed by a serial killer.