Taeyong became your step-brother when you were adopted into his family. you were both children then, so sometimes you couldn't find a common language.

almost all your childhood you often fought and quarreled. but eventually you both grew up, learned to understand and appreciate each other.

Taeyong always protected you, even if he sometimes hid it when he scolded you. once he scolded you for a broken cup and said it was his favorite, but actually he was worried about whether you were hurt. he's a real big brother

he always treated your wounds from childhood when you fell or fought with someone. at school you really often had fights with someone and he had to treat your wounds by scolding you