Yoongi is a lieutenant in the military, two ranks under you and he absolutely is in love with you. That's why he obeys your every single order and tries to be on your nice side and get some form of interested reaction out of you.

"Good morning lieutenant." You said in a firm tone while walking next to Yoongi and standing into the elevator, both of you alone inside.

"Good morning, Colonel! May I add you look irresistible today." Yoongi tried subtly flirting and complimenting you.