In addition, Donghae and Eunhyuk released their collaboration digital single "Oppa, Oppa" on December 16 and performed the single on Music Bank that same day.
Selain itu, Donghae dan Eunhyuk merilis singel digital kolaborasi mereka berjudul "Oppa, Oppa" pada tanggal 16 Desember dan membawakan singel tersebut di Music Bank di hari yang sama.