In the blink of an eye, three months had passed.
Shangguan Xiu kept those five people locked in the small room for three months. Every day, he would only open the mechanism to drop food and water into the room so they wouldn't starve.
During these three months, Shangguan Xiu had figured out everything in the castle, including the many documents left by those five scientific freaks, which he had read.
Consequently, Shangguan Xiu learned everything those five people knew in a short time.
During these three months, Arthur only saw Shangguan Xiu when he ate. At other times, the nanny robot took care of him, and the toy robot kept him company, chatting and relieving boredom.
As a result, the little guy had developed a deep emotional attachment to the toy robot.