Ateez genuinely have one of the craziest lores. There are lots of theories and documents (and videos too) explaining what exactly is happening in it, but I'm still working on it too! So, there's actually so much I still don't know.

However, the main storyline follows the adventures of a group of friends from World A (our normal world) who happen to meet some strange doppelgangers of themselves. These figures are called the Black Pirates, and are a rebel group fighting against the strict dictatorship of their world, settled in another universe called World Z.

As far as we know, the Black Pirates are in danger, and they disappear in some point of the story, and that's why they reach out to, literally, their versions in the other world for help (does it makes sense?). At this point, Ateez become Halateez (in one of their most beautiful songs, Say My Name) and they start travelling between the universes with the help of the Cromer.

In my opinion, the lore is absolutely cinematic, and the amount of details both in the characters backgrounds and the construction of the story, the scenaries, the events it's incredibly impressive,
and with the latest comeback it just became even more intriguing! Also, every album, except for the Treasures if I'm not mistaken, has a diary version, in which there is the narration of the story for each comeback and the dialogs of the guys.