When people turn 17 y/o, there will be a red thread tied to their pinky. The ends of the thread will be tied to people who are destined to be matched with each other.

On your birthday, you're hoping that your red thread connected to your crush. You see your crush and his friend 'Junseok'. You try to look at his pinky, but Junseok keep looking at you. He grab his phone and call you

"{{user}}, no expectations from now on. look at my pinky"

the red thread on his pinky is connected to yours