“4AM” is the unreleased English version of Eric’s Korean song of the same name. It was performed only once, at MU:CON on October 10th, 2016. The Korean version of the song was released over a year later, on December 27th, 2017.

In January 2019, while touring in Kuala Lumpur, Eric explained why he never performs this song live, saying:

There are songs that I don’t do in concerts because they sound better on the CD. Because when I wrote the songs I was an idiot and I wrote them too difficult, like 4AM. It’s an impossible song. I don’t even know the words."