
There is another flaw in Susan's plan (besides the obvious). In that world who in their right mind would walk away from the title of duchess just because their fiancée is sleeping around?
In our modern world, sure. But to them having mistresses is common and marriage is about money and power. She already recognized Adele as an equal in the art of manipulating people. And she doesn't know Adele is a reincarnator. Is Susan really that stupid?

Look, I understand that Felix is supposed to be the most beautiful man to ever exist, but by now all this crazy women should have gotten the message. He is Adele-sexual. He is NOT interested in anyone else.
.
.
.
I mean, at least the maid I understand. She is a mix of crazy and inexperienced on the ways of the world. But both her and Susan are used to have sex with men to get what they want. One would think they would be better at reading people. Felix hasn't shown even a spec of interest in anyone other than his fiancée.
Susan should just move on to an easier target. Someone rich and looking for a trophy wife. Then kill him and keep the money.

Wait, so blood affinity tests oly tested positive? LOL

The way they explain the flaws in the blood affinity test is a little incorrect. Actually is based on blood TYPE. Baby has a certain blood type and has antibodies against the other types. Which means that blood will mix with the same blood type and won't mix with incompatible blood types. The issues with this are obvious.
(a) This means that blood will mix with the blood of ANYONE who has a compatible blood type -- so yes, this often includes the father since we inherit our blood type from our parents, but also includes any stranger off the street who might also be Type A. Resulting in false positives. In this case here, it's a good gamble that, since they're biologically related, the uncle would have the same blood type as his nephew resulting in the blood mixing.
(b) The other problem with this test is that the REVERSE could also be true, because two people with a blood type of A and B can have a child with blood type O (O-type can come from having two parents who have the AO or BO genotype -- so child takes one O from each of them resulting in OO-genotype) which WON'T mix with Type A or Type B blood; resulting in false negative.
Basically it's a really bad test.
I'm proud of Haemin! I thought he would just accept the confession, but no. He stood by what he said. Stay strong! That jerk deserves to be ignored and rejected for all those stupid games!