What was the release date of a song by  Bae Su-ji that sold more than 1.3 million copies?
Dream (Suzy and Baekhyun song) "Dream" is a song recorded by South Korean singers Suzy and Baekhyun, members of K-pop groups miss A and EXO respectively. It was released digitally on January 7 and later physically on January 14, 2016 by Mystic Entertainment. Having sold over 1.3 million copies, the song received multiple accolades at major South Korean music award shows in 2016.
Spy (Super Junior song) "Spy" is a digital single by South Korean boy band Super Junior. It is the second promotional single for the group's sixth studio album "Sexy, Free & Single" and title track of the repackaged edition, titled "Spy". It was digitally released on August 5, 2012, along with three other new tracks in the repackaged album, which was released offline on August 6.