
Just an assumption, is he maybe affected by his affection score for yvone, so he is not able to think clearly about Penelope?

I also want to know because I'm hating Derrick
Deep inside I think that the bias that he has against Penny is genuine because just after knowing about the poison, he has many questions but the one that leave his mouth is related to Yvonne, and he seems more concerned about Yvonne being suspect than Penny's health
How awesome this manga is:
When my kids(1 and 3yr) grow up, im somehow gonna get a physical copy for this manga and gift it them.
PS, Im not in Japan by the way