Responses
is it this? https://www.mangago.me/read-manga/the_precious_sister_of_the_villainous_grand_duke/
this was the first thing that came to mind
Yes! Thank you ε=ε=(ノ≧∇≦)ノ
The title of this manhwa please
FL has a pink hair. She transmigrated into the body of novel's character. The character is the villain's sister. But since they both has rough childhood, they didn't form any sibling bond. When the fl transmigrated, its around she still a baby and the villain just a child. If I'm not wrong, the family has strange tradition where only the strongest allowed to survive. So they are allowed to kill each other sibling. The head of the house has many wives and childrens.
There this one scene where baby fl gave her bro a bottle milk so they can share nutritional drink.