How did Yu Zecheng get the list?

There is no mention of how Yu Zecheng got this list. This link is really not mentioned in the play, but it can be seen from the way it obtains other information. Here, the plot omits the steps of obtaining information. Recently, Yu Zecheng, a neat little intellectual, was wrongly arranged to marry Cui Ping, a rude rural guerrilla. Yu Zecheng is an ordinary man, but at the same time he is also an important spy who broke into the military system. He is introverted, but he is very heroic. Simple, inflexible and provocative, Cuiping in "Honesty and Honesty" can't adapt to the life of an official wife who eats western food and plays mahjong, and makes many jokes. Ping Cui is brave, even reckless. She didn't understand Yu Zecheng's hidden work, and she urged to leave many times. The two also have conflicts in life details and personality.