Help I can't sleep

I'm looking for one (two?) Webtoons and I can't find their names (my head hurts so much)
One were the 2nd prince (not the ML) is making himself look dumb so he doesn't get assassinated by his brother but he is very smart and strong (he has long blond hair and glasses that he doesn't need) at some point he is engaged with the FL's friend.
And the other one (or maybe it's in the same one) where the FL dad tries to khs after his wife dies of illness because he just got the cure the moment she dies.
Please ples please please pleas thank you I love you