Ok so these guys are what's left of the mercenaries
So i don't want to give much spoilers, but...
betrayal, traumas and explosions. And here they are
Mercenaries hates Marhen, Marhen hates Mercenaries. https://t.co/w3zxTUdFo7

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Basically Turbo and his crew let their last engineer die
Then they buyed marhen (he's a slave) On his first year he did great at fixing stuff but still being treated like an animal by the crew. only after he show his skill with combat they started to treat him like a brother.

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