At the end of the Korean movie Moss, the male protagonist recalls what the woman who started calling him said something! What does it mean! ! Please answer!

My understanding after reading this is that when arresting Old Man Qian, Zhiying said that the teacher committed suicide in order to have his son come back for trial. Zhiying also told the teacher's son about his tragic experience. I think the teacher's son finally remembered that Zhiying called him and asked him to come back. Maybe he felt that his father did not commit suicide, but was killed by Zhiying. of. The reason why Zhiying behaves like this is because she wants to free herself.