That was certainly a different view than I was expecting. However, it's also an interesting way to allow multiple PoVs (especially around a minor mob character)...
Though, I guess the game's MC merely simplified their past to him harassing her before the entrance ceremony which is why protag wouldn't know about the mob's past.
Still, isn't that basically a slave contract?!? I'm glad mob-kin was decent to not use it, but why does that even in play here???