I don't remember any title's Things

There's 4 main character: 3 of them is friend together in which 2 of 3 is a couple and the other one is crushed by younger brother of 1 out of the couple. Idk what I'm saying because this is my friend trying to describe this me but it's definitely a manga and it's yaoi. Pls help my friend cus they were trying to find it for weeks now.

The manhwa that has mc transferred to another world, she had red hair, villainess be4 and she was unalived be4 our mc being in the body.

Istg i kept trying to search for it but still couldn't find it
A few thing i remember abt this manga is that it's yaoi, omegaverse, the uke is giving the seme 1 week (?) to make him in love so that he wouldn't remove the bond thingy. They were bestie or classmate something.

It's shoujo
The fl has white hair
She's some shorts of image of a white lily (?)
She has some illness that she can only live for a shirt time, she had bad relationship with her family but it get fixed up during the time she isolated herself.
She made friend with dark hair knight ( Or duke something idk) cus she said she had never had a friend.
I swear i don't remember the title at all.