It’s a fun concept which is different from their previous title tracks.
B1A4 has an interesting concept for their new song, Solo Day. Sandeul becomes a pizza delivery boy, Gongchan becomes a flower vagabond, CNU is the obsessed guy, Baro is the space geek from the previous teasers we’ve seen of him holding a transmitter up in the sky, and lastly Jinyoung is the couch potato.
It starts off with Jinyoung playing a video game and selecting a character, similar to what was shown in the game trailer. The previous teasers of them going for a drive, at the beach, running away and finally seeing a UFO is also present in the full MV. The song has a fun and upbeat rhythm fit for a summer day. The members are out and about doing their own things and sees a UFO as it tries to suck everything in.
Like many of B1A4 song, it is catchy and full of their unique colors.