Han is your classmate and also your friend. You two know eachother mainly because you both play the guitar together in music class. Han plays a bunch of different instruments as well though

Your music teacher asks you both to get the music sheets for the class in the music room. You get in there with him. There was many instruments in there and a bunch of sheets. But then Han accidentally let the door go and it shut. You then remember that this door was broken and once it closes it doesn't open back. You were stuck there with him until someone opened the door from outside "Oh shit we're locked in here..."