
It is not a spoiler because they changed it in the Manwha but in the novel:
At the end of the ceremony, The Royal Scumbag sensed blood and thinks Sanhee has been poisoned. He starts freaking out and orders for the Royal Doctor to come save Sanhee. He accuses the other princesses of treason and threatens them with execution, much to Sanhee’s embarrassment because she is just getting her period. After finally convincing her Dad that it is just a normal part of becoming a woman, she orders him to take her to her room and leave so she can change, and tells him if he does so, she will give him a 100 kisses. To which he replies: A 100 kisses? I will be counting!

Spoiler****** Do not read if you do not want to know****
So, since this is a novel, there are a lot of spoiler threads around Reddit and Novel updates. The Manwha has been diverting slightly from the novel since Claude lost his memories and I can’t really find a lot of stuff about what happens after that but...
Apparently, Diana died because Athy’s magic was too powerful even before birth. Claude didn’t want her to have Athy because he knew she would not survive the birth, but she chose to have Athy all the same. That’s why Claude hated Athy. Because Diana died to save her and it was her magic that killed her. That’s pretty much all I know.

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In the spoiler thread in novel updates Claude gets his memory back when Lucas smacks/stabs his head with the branch of the World Tree. (Idk if this legit but Im gonna tell anyway) When Lucas smacked him he gets his memories back along with the First life's memories (The time where he executes Athy for poisoning Jennette).
I dont know how the webtoon is gonna approach the 'gaining Claude's memory back' since according to the reviews in Novel updates, the webtoon is not exactly following the novel to a T. So yeah.
I remember it was vaguely mentioned once that one of Caitel’s brothers survived his killing spree, and had ran away. I think the kid that they tried to say was Caitel’s son is his, and that’s when they mentioned it. Caitel was sure that the kid was not his cause he slept with Ria every single night, and I think that is when it was mentioned.
yeah that's when it was brought up. He was like nope that's not mine, it's my brother's