Edgar, why Korosensei?

Edgar Korosensei is a teacher looking for the Walden family's wealth. According to relevant public information, Iger killed his teacher out of subjective intention. Although the teacher did seek the wealth of Walden Lake, it was only an excuse for Iger to think that he killed people, and it was also the first step for him to start blackening. Gold, Edgar's companion, violated the symbol of natural laws with fake alchemy and killed the teacher.