Idk how to do the spoiler warning bold eme eme... But.
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Basically, that's why who ever the light pink haired name is, has no reflection in the tea cup is because she's already dead and someone's occupying her body. If you saw that there's still light dot in the Older brother, the maid and the head maid is because they're being controlled by her. If you read some of the earliest chapter or the Penelope's dream part, you'll have the gist that Yvonne is the main antagonist.
Spoiler
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Yes, it was actually a lot of twist. I hope you'll understand my english. The Marquis mage woke up from the brainwash of loving Yvonne in the first real life of Penelope. The Goddess idk the name is, is being being worshipped by Yvonne (there's a black magic). And the Goddess hates Penelope so she make her, in the eyes of everyone, is the villains..... Why the fuck my explanation so messy?

Bro I feel bad for Derrick this guy is being controlled like a puppet with no free will wonder what kind of black magic yvonne is using