Yong-xin is a star prosecutor in the Southern District Prosecutor’s Office. She is attacked and falls unconscious after being assigned to investigate a high-profile random killing case.Yong-xin wakes to find herself in Jialin County in 1992, the place where she spent her unhappy childhood. Here, Yong-Xin is a prosecutor demoted from the central government to the local area. However, compared with her local colleagues stuck in their outdated thinking, Yong-xin is equipped with a modern approach and makes several breakthroughs. She is put on a case with the team investigating a serial kidnapping case. During the investigation, she discovers that many mysteries wrapped in the case lead to her younger brother and father, the memories of whom she has long put behind her.

As she tries to pursue the truth in 1992, Yong-xin starts to remember the answers to her fading memory and confronts her own deep traumas. All the people in 1992 seem to have connections with her in 2022. What’s the reason behind her travel back to 1992? Is the threat she’s facing in 2022 related to everything that happened in 1992?