In this chapter, we learn that the "branch pen" that Cai Ming-liang wants to check is actually the "world tree" , which means that it's derived from the "sources" of all the trees in the world. This means that, if the "pen" recognizes the world tree, it can't be counterfeited, and that, in turn, Cai Ming can use it to track down his sister.
In this chapter, we learn that the "branch pen" that Cai Ming-liang wants to check is actually the "world tree" , which means that it's derived from the "sources" of all the trees in the world. This means that, if the "pen" recognizes the world tree, it can't be counterfeited, and that, in turn, Cai Ming can use it to track down his sister.