Why?

One month later…

In the military hospital hallway, Dr. Xiao was walking along with her assistant clad in scrub. Both of them were wearing masks as they conversed quietly to each other. Everyone who passed by thought that Dr. Xiao was imparting some important knowledge to the assistant. As such, they merely greeted her with quiet greetings of 'good morning, doctor' before continuing on their way. Dr. Xiao was a renowned figure in the medical field and everyone had gotten used to people trailing after her, wishing that she could be interested in taking them under her tutelage. 

That was how Zachary – aka the little assistant – was able to evade suspicion up until they arrived at the former Crown Prince's medical room.

Coincidentally, it was the period for shift change. There was no one guarding in front, enabling Zeke to enter smoothly with the help of Dr. Xiao's permission card.