In 2012, Baek debuted as part of a South Korean duo called
15&, along with
K-pop Star season 1 winner
Jamie. Following the duo's hiatus in February 2015, Baek was featured in a number of tracks such as "Excited" by rapper
Olltii, "On & On" by rapper
Yuk Ji-dam, and "Me You" by rapper
San E, all of which topped realtime music charts. On November 25, 2015, JYP Entertainment released the teaser for Baek's upcoming debut extended play,
Frank, along with a teaser photo with the upcoming single "Across the Universe". The following day, the teaser for the music video, "Across the Universe" was revealed. On the 27th, the track list, along with 15-second snippets of the songs was released on Baek's
Instagram account. On November 30, 2015,
Frank was released along with the music video of "Across the Universe". == Track listing ==