Whether it is FJ’s original comics (one set of pirated copies at home and one set of Taiwanese versions have been ripped apart) or the occasional small originals in old animations, this sentence does not exist, but it frequently appears in fan fiction , especially Mary Suri. There is a post about this in the Hunter Bar that you can check out. It is a research post by Lan Xiaoqin, the author of "Qi Ya and the Road of No Return". It clearly analyzes that this sentence should be from a certain fanfic, because it It is seriously inconsistent with the leader's philosophy.

"Which of us would betray the brigade for these reasons?" comes from the conversation between Captain Youke Xinpian and Wo Jin, from which we can see Chrollo's attitude towards the word "betrayal" Understanding is completely contrary to "betrayal exists from the beginning".

As for why it is so popular...actually...I don't know.