Slight continuity problem. First frame showed her next to Lily, next time she appears she's alone in the frame. At the end, Lily's there again.
Trying to decide which is supposed to be the genuine affectionate look from the Duke, the one he gives her or the one he gives the saintess. Right now, I feel like they're completely different, but neither seems 'fake'. Also, yandere maid and sudden demise of tailor and the series description all have me thinking there are complications that may include his genuine feelings for her.
On the other hand, it may be about him trying to fool the king, who seems to have ordered this marriage. He may just be trying to present the appearance of a happy marriage. The fact that he seems to have refused to make a baby with her is sus.
Still early. Whether this is a good, complex story or a cliche still remains to be seen.