The popular duo has been on a hiatus since the release of "First Love" in January. According to Ilgan Sports on March 14, the reason behind their sudden halt in promotions is Ahn Ji Young's academics. 

SEE ALSO: 'Moving' receives a 19+ rating ahead of MBC TV premiere

Currently, Ahn Ji Young is a Contemporary Music student at Sungshin Women's University. However, the singer was unable to attend her classes due to her busy schedule for Bolbbalgan4. The continuous absence led to an academic probation, and as a result, she has decided to focus on her college work in the first half of 2018.

This does not mean Bolbbalgan4 has stopped their musical productions. The duo is working on new songs, and Shofar Music stated, "The concept and details are not yet confirmed but we're continuing the discussion on their next album."