Originally Posted by
Ryll
Suirei didn't have to, Maomao solved the mystery that allowed the technique of fabricating an alloy that melts at super low temperatures (i.e. candles) to be replicated. What's not clear is if the father made the deliberately faulty parts before he died or if the three sons did. Given the timelines involved on the other schemes, we should probably assume Suirei ordered the deliberately faulty components from their father. After that, we got open confirmation that she was the one that orchestrated an opportunity to swap them. We should also assume that given Suirei's medical knowledge, she was the primary actor in the other murders related to getting officials capable of blocking the main plan with their superior oversight.