These four people, two guarding outside the courtyard, two guarding inside.
This setup is the most troublesome. If anyone tries to forcibly break in, there's no way to handle all four of them at once without making a huge commotion, which would naturally alarm the members of the Su Family.
However, during this process, Su Yang figured out the eating habits of these guards. He got acquainted with someone working in the Su Family's dining hall and learned that these individuals had the habit of eating late-night snacks. This realization immediately made Su Yang's eyes light up as a plan started to form in his mind.
Under normal circumstances, Su Yang could leave the premises after finishing work at 10 PM. However, the Su Family also provides dormitories for staff members, and many employees just stay the night if they work late, which happens quite frequently.
