After South Korea (played by Michael) and Gu Tao succeeded in undercover, many people thought that Gu Tao was the biggest BOSS in From the beginning to the end and the culprit who killed Luo Fei. In fact, the real ultimate boss has not officially appeared. This is the mysterious boss MASSJER played by Yin Ziwei, the "villain occupation". He is the most key figure in this drama, connecting all the characters and plots in series.

Masteel not only has more resources than Gu Tao, providing transportation routes, information and goods for Gu Tao, but also has a strong undercover. Han Chudong's ultimate intention of letting South Korea approach Gu Tao is also on Ma Jiajie, who has a strong sense of prevention, but his relationship with Gu Tao is very special, which is also Ma Jiajie's weakness. Only through Gu Tao can he approach Ma Jiajie. A good beginning and a good ending;

A good beginning and a good ending is a criminal investigation and anti-drug drama produced by the Golden Shield Film and Television Cultural Center of the Ministry of Public Security, Beijing Aiqiyi Technology Co., Ltd. and Haining Weijun Tianzuo Film Co., Ltd., directed by Song Kai, starring Michael and Sun, and starring Xue Haowen, Yin Ziwei and Li Kunlin. The play tells the story of the police officer Han Fang (alias Fang Mo) sneaking into Cang Lan as an undercover and destroying drug trafficking organizations abroad in one fell swoop.