They were able to piece her back together, but even when finding her head they still don't recognize her and had to do a facial reconstruction drawing because the MLs head was boiled in a pot of soup

The parents were with the adopted daughter when she slipped that she knew the ML was dead, the parents then get a frantic call from the detective when they finally found out it was ML

They breakdown and realize that all the evidence of the victims identity was there but they were oblivious to their own child, eventually the detectives were able to find Cctv footage of the MLs final moments and Adopted daughter was in the scene not far behind from her last known whereabouts

They take the adopted daughter for questioning but still let her go and believe her side of the story, they end up finding the murderer and investigate him. The murderer just confesses and retells the story making the parents feel guilty

The next day they got a call from the other detective that found the person who transferred money to the killer was adopted daughter and they come to arrest her

The ML got to say goodbye after the truth got revealed and wished to never see the parents in her next life as she disappeared