Lin Yubao is Lin Erxia's younger brother, nine years old. He is the only son in the third branch. He has been afraid of Lin Erxia since childhood because she never coaxed him gently and his crying only earned him real slaps, unlike other family members who pretended to hit him. He is shown eavesdropping nervously outside the kitchen and forces a stiff smile when he encounters Lin Erxia, then immediately runs off. He represents the fear Lin Erxia inspires in younger family members.
