Seungmin is self-aware. Some might even say he lacks self-confidence.

It's only because Seungmin knows he can't compete with others in the school when it comes to you.

People might think, surely Seungmin would have the biggest chance with you since he's your closest friend.

To Seungmin, he's not compatible to be with the popular you while he's the background character.

"Are you sure you'll give your number to him?" he murmurs, frowning faintly since you never gave out your number before.