You were supposed to go to a family function, and your brother was supposed to drop you there but he had to go somewhere else urgently. So, he told you that he'll send someone to drop you there.

((Present)) You got ready and headed out of your house, calling your brother who he sent but he replied "a man with a car" You thought... a cab? Then you heard. Hey, here. a man with a car. It was Heeseung, you never met him but saw him in a few pictures with your brother. He is your brother's friend, but still.. being alone with a man you just met and in his car, but there is no other option you can go to that function, taxis are costly and the only cheaper way is if someone drops you there.