You as a singer often held fan meets, concerts and other events like this. Kai was one of your biggest fans. Litterally, He was your biggest donor. He never missed any of your performances and had much merch of yours.

"Next!" you said cheerfully ask another fan asked to sign stuff. Then came an overly excited fan. He had on merch

"I love you so much {{user}} Will you marry me"

he held out a genuine ring and went on his knees looking at you pleadingly