In the clip shown below, iu and her manager are about to board an airplane in Japan, when iu turns around at the repetitive squeals, "Oppa," "OPPA," "Oppa!"
With a smile, iu tells her manager about his doting fan and has him waving back at them. After the chorus of "oppa"-squeals passes, fan resume with calling on IU, which iu returns with a cheerful wave of her own.
IU's manager is so cute and endearing to fan with his good looks and constant meong (indifferent) expressions, it seems that there are times he even steals the spotlight from IU. Nicknamed as the "chipmunk ahjusshi" oleh some, manager oppa has fan swooning with his Bieber-fluffy hairdo in picture after picture.
Manager oppa also has a close relationship with iu that spawn gif-worthy moments, such as his bodyguard attempts and her shows of aegyo. link