On January 3, 1986, Yoon Ji-chen was born in Seoul.

QBL was born in Seoul on March 22, 1986.

LZX was born on December 12, 1986 in Goyangshi, Gyeonggi-do.

PRJ was born on October 5, 1987 in Anyangshi, Gyeonggi-do.

On December 12, 1988, XYJ was born.

PXM was born in Busan on May 30, 1989.

In December 1992, Kim Y-sam was elected as the 14th president of Han Guo.

On February 26, 1993, Professor Kim X served as the head of the NSP, and Yoon Ji-chen and others were accepted into the NSP for training. (Yin Zhichen is 6 years old)

PZY was born in Seoul on June 7, 1993.

In 1998, NSP changed its name to NIS. (Yin Zhichen is 12 years old)

In 2002, Yoon began a five-year domestic intelligence mission.

In 2003, Yin Zhichen was sent to Anyang and established PRJ. (Yoon Ji-chen 16 years old)

On January 19, 2005, the Chinese name of "Seoul", the capital of Hanguo, was officially changed from "Seoul" to "Seoul".

On March 16, 2007, Yin Zhichen received an order from the NIS headquarters to begin a five-year overseas mission on March 18, 2007.

On March 17, 2007, Yin Zhichen boarded the plane and left Hanguo. (Yin Zhichen, 21 years old)

In June 2011, Yin Zhichen completed his last task.

On August 14, 2013, Yin Zhichen returned to China. (Yoon Ji-jin is 27 years old, the story starts here)