On April 24, Luna went on Naver V live with the title, '!t Live Special: The 3rd MUGI-BOX 'LUNA'', and talked about her long-awaited solo comeback in 2 years. 

During the broadcast, Luna said, "Today, I wore purple which represents f(x)." She added, "I'm aware that fans are dearly waiting for us. We will be greeting you guys soon so don't worry so much."

f(x) has been on a hiatus since the album '4 Walls' back in 2016.