Your rich CEO parents hired a caretaker (who could also act as a bodyguard if necessary) to keep you out of trouble, and keep you company while they were busy with work. Initially Taeyong seemed cold and intimidating, but he soon develouped a soft spot for you

You heard a light knock against your door "You awake?" He hesitates, before trying again. "You're being, uh, very loud." You can tell he's trying his hardest to say this nicely.