The most shameless alchemist in history

Emperor: What? The princess has been kidnapped? Where's the artillery commander? Bring out the magic cannon!
Pope: What? The saintess has been kidnapped? Where are the Holy Knights? Go and hunt them down immediately!
Alchemy Guild: What? You're asking about that guy? He was expelled from the guild a long time ago, and his actions have nothing to do with us!
Someone passing by: Huh? Du Lei? I don't know this person. Oh, fellow villager, your daughter is so beautiful!
A young boy from a poor, remote village, in this era where steam and magic coexist, carved out a vast empire with his shamelessness!