It was in one of the rooms available in Madam Dongxia's apartment—the affordable if not somewhat shabby building—it was the place where two siblings happened to be together on a Saturday weekend. And it wasn't actually that often that the two found each other in quite proximity to one another. Their age gap was too far for them to form a proper bond.
But it was the perfect way for a much older brother to teach his younger sibling with little problem. Answering and explaining things were a piece of cake. (He could actually use one slice right now) Han Jing instructed the younger girl on how to compute areas, radius and such with only a small cajoling of his memory.
There was also the fact that he had a… Skill for this situation.
