“DiE4u” is the first single released from the follow-up EP to POST HUMAN: SURVIVAL HORROR which released in October 30, 2020.

The song blends influences of emo, pop, rock and contemporary music to create a style described by front-man Oli Sykes as “future emo.” Lyrically, the song deals with addiction from the perspective of a toxic relationship.

It’s kinda like tackling the song as if this unhealthy obsession that I have is a relationship, and almost like a mistress really. […]
[When you’re in dealing with an addiction] it’s like you’re having an affair for other people and stuff, cause you’re doing this thing behind everyone’s back, it’s a secret, and it is like you’re cheating on people or betraying people and stuff. I obviously never saw it in that way- I always just though “I’m just harming myself, I’m not harming other people” and I mean, I knew I was harming people but I didn’t quite the level of how much it can fuck up people’s trust and stuff like that.

—Oli Sykes, NME

Sykes himself has experienced drug addiction in the past, saying that it “took away who he was” and nearly resulted in him ending his own life. Sykes later found relief after attending rehab sessions, though disagrees with some of the principles used in his recovery.

In an interview with CD 92.2, a local alternative rock station based in Columbus, Ohio, Sykes delved further into the themes of addiction and recovery that the song explores. Sykes stated that the result of COVID-19 induced isolation forced him to deal with several aspects of himself that he thought he had healed from, saying:

It spiraled out of control, and I did what I did when those problems used to be more at the forefront. I started using again, abusing shit…for me, I had to sort all that shit out in lockdown. I couldn’t go back into the world the way I was…DiE4U is all about the realization where I went, ‘Fuck, I need to cut this part of me off and say ‘This is not happening anymore’, because it was very murky before, back when I was like ‘Oh, I don’t abuse drugs, but I’ll still have a drink and I’ll still have a smoke’, or whatever and it was just, I was always leaving that door open and I needed to shut it.

—Oli Sykes, CD 92.9 FM

The track was officially announced on September 2, 2021, but frontman Oli Sykes teased a master of the track on TikTok days prior, as well as the band having posted photos from the set of the music video to their social media.