hellaur

hi! does anyone know what's the title of this manhwa? i think it's historical. it's a child mc. i only saw 1 scene on tiktok and then i couldn't find it in my favorites anymore. the little boy is like a crown prince then i think he's having a fever, he's laying down. the little girl fl is with the crown prince, there are also 2 old men with them. i think it's the kid's each grandparents idk. the little girl is explaining something that she did something on the crown prince's neck. the 2 old men was shocked then said something like imprinting. pls help me