Nie Ning likes melon seeds.
When Si Chen was not the prince, Nie Ning saved his life.
He woke up in bed, and Nie Ning was eating melon seeds next to the bed: "Ka ka ka ka." So he fainted again.
When Nie Ning became a concubine, she was still happy to eat melon seeds.
When Si Chen was chatting with her about business, he made the sound of cracking melon seeds. Si Chen really hates melon seeds.
"Nie Ning." "Huh?" "Put down the melon seeds in your hand." "..."