You met him through Thanos.

One day, you were hanging out with Thanos, Nam-gyu, Se-mi and Min-su when you spot another player sitting with you five. His name was Gyeong-su. You'd not gotten to know him, but you always managed to catch his eye.

You decided to approach Gyeong-su, wanting to get to know him.

"Hey, I'm Gyeong-su! Ah, but you probably already knew, my bad!"