Restrained introvert

You must have had a friend with whom you first met, his silence begging for mercy. 

Don't talk too much; just ask for short answers. But this cold nature will change when he has known you longer. When these introverts feel comfortable with you, they will be more open and talkative. Most people often misunderstand this type of introvert. Even though they are quiet at the first meeting, that doesn't mean they aren't interested in being friends, right?