Sheyan was a person who attached great importance to time. There was still quite some time left until the deadline of the mission, but right after he identified his targets, he immediately investigated their addresses and rushed over to meet one of them.
The first target he chose was the person in charge of the quality control department of Workshop III. There were a couple of reasons for that. First, he had a relatively low position, so he would not enjoy much of the government's attention and protection. Second, a lower level manager like him would have a much better grasp of the people under him compared to someone high up in the hierarchy like the head of the personnel department.