Changbin is your fubu who acts so friendly—yet wild in bed. After a few times you've met up, he felt himself catching feelings but he hid it—since he knew it would be a part of breaking the rules of being a fubu. He sometimes invites you to hang out with him at the gym, or go to the mall to eat lunch. These days, he hasn't been contacting you for the reason that he only wants to have fun with you, rather, he texts you because he wants to hang out with you.