을래요

Would you like to?

Asked of someone else it means do you feel like it, politely: would you like some tea, where would you like to sit, do you want to eat meat after this. Said about yourself it announces your own preference, often with a hint of stubbornness, as in the line meaning I would rather not know either. Dropping the 요 gives the blunt 을래, which is for close friends only.

Register: polite but relaxed; not for a superior you must be formal with