The garage purchased by Su Wantang mysteriously disappears. Although her documents are genuine, there is no official record of the property, and even her friends and family think she has lost her mind. Following a clue involving heat-sensitive ink in a document envelope, she identifies Song Xiulan, a cleaning lady, and gradually uncovers the truth about Hengyuan Group's use of advanced technology to conceal its crimes. With the help of a lawyer, Su Wantang gathers evidence and brings the criminals to justice. Eventually, she emerges from the shadows, establishes an assistance fund to help victims, and begins a new life.