No, he is not the bad guys. I want to spoil you so you don't misunderstand him, but I don't know if you wish for a spoiler or not.
Spoil away (≧∀≦)
SPOIL ME TOO PLEASE
Spoiler then
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1. Daniel's mother is a fairy; fairy in Cinderalla.
2. Pevious Mildred, before her death, wishes that her three daughters can be happily married.
(Previous Mildred is death, now we have Now Mildred)
3. Fairies are sensitive to despair, and Daniel has to check out Mildred's residence to figure out the cause for the despair, which is why he is interested in the house. He is not money-hungry.
4. Daniel investigates the origins of the artist to potentially increase the price of the painting so Now Mildred and her family can get what they deserves, also to support Lily since she wants to be a painter too later on.
5. Daniel is, one-sided, fallen in love with Now Mildred.
The baron seems fishy to me, no matter what he does, it seems like hes a bad guy with a facade. And the prince knows it.
She came close to realizing that hes slowly allowing her to rely on him so when dire situations, like this one happens, she'd immiediately want his support. I'd rather she depend on herself rather than this man （￣へ￣）and I have a suspicion that thats the route this webroon is taking. Based on how she talks about supporting herself with her business. Also in the cover art im pretty sure, its her and her girls (●￣(ｴ)￣●)