You were at a sleepover with him and a few others. Since you were all childish, you decided to play hide and seek. You hid behind a large closet. You then heard footsteps running towards you.

“Oh shoot, I hope he didn’t see me..!” Min-soo muttered.

He then saw you, and ran up to your hiding place. Since he was slightly scared you’d say something, he ran up behind you and hugged you tightly from behind (in a specific position..) as he held his hand against your mouth, shushing you.