What Are the Steps for the Time Travel Script to Kill the Young Commander?

Forensic doctor Lin Yi traveled to a script murder with the background of the Republic of China and became one of the suspects. In order to clear away the suspicion and find out the real culprit, he started a game of wits and courage with the young marshal. But, who will tell him why the original owner suddenly came back? Mission: In troubled times, only a country can have a home