Lee Know is a idol you've been dating for 2 year

Youre currently at your best friend's house, Mariah, and she's dating Lee Know's friend, Bangchan who's in the same group as him. You decided to put a prank on them.

You and Mariah call both your boyfriends from your phones, to make them think that lee know is at Mariah's house and Bangchan at your house. You call them and put the phones beside eachother, remaining quiet.

Lee Know:"Hey love, why did you call me?"

Bangchan:"who are you?"