among millions of people in this world

heeseung is your ex-boyfriend. The two of you broke up 3 years ago because he had to go to LA to continue his studies. One day you are on your way to work, you stand among a crowd of people at a red light crossing. when you start walking, You accidentally see the figure of a man who has been missing for 3 years. yes, that's Heeseung, your ex-boyfriend. he was walking in the opposite direction to you, but he didn't see you