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.
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
I enjoy this for the pretty characters and clothes design. Forget about the plot and any nonsense. I'm in for the visual (๑•ㅂ•)و✧