Fun fact: They actually recorded the guide version for the Korean version of Little Mix' "Wings". Someone from their company heard it, liked it a lot, and thus they became a duo and got the name WINGS.
(As said in the description, this is just a vid of them going out for the last time before debut. They eat some nice food, go to a karaoke bar, eat some more, and are adorable.)
sources: ARIRANG RADIO, WINGS official FB page