How Could My Cute Childhood Sweetheart, Raised Since Childhood, Be Just My Brother?

When Li Xingmian was six years old, his father brought an unfamiliar little child before him and said, "From now on, he is your younger brother. You must protect him well, understand?" The little child was sweet and adorable, like a beautiful ragdoll kitten. Clutching his slender, pale fingers, he called out softly, "Brother." From that day on, Li Xingmian shouldered the important task of protecting his younger brother. His eyes and heart were filled with this little one who belonged to him. He spent all his time figuring out how to plump up the little child a bit. For instance, during class, while the teacher wasn't looking, he'd secretly slip the little one a milk candy or a bite of swe...