After SHINee’s “View”, “4 Walls” confirms LDN Noise as the center of change in K-POP sound towards the west, bringing to the world another “UK influenced” track.

In november of 2015 the (non-official) demo version of the song appeared on Youtube:

https://www.youtube.com/watch?v=vFuU4rIZZ30

In july of 2016 LDN Noise released a mashup of their two mentioned songs:

https://soundcloud.com/ldnnoise/view-vs-4-walls-ldn-noise-mashup