Who is the white bone in Matou Village?

Guo nian. According to the query of Sentencing 3 1 episode, Guo Lun suspected that the female white bone in Matou Village belonged to her sister Guo Nian, but Marathon flatly said no to comfort Guo Lun. Guo Lun sent an anonymous letter to the police, which contained a strand of Guo Nian's hair and asked the police to compare the DNA of the female corpse. After comparison, it was confirmed that the female skeleton was Guo Nian.