> you clicked 'the fever & treasure series'
the fever & treasure series
These two series make up the beginning of the storyline (as of right now they are the only series released).
Chronologically the Fever series happens before the Treasure series - while Treasure tells the story of the beginning of their journey (as Ateez), Fever focuses on the characters' backgrounds / individual stories and how they got to where they are in Treasure / how they became the individuals they are in Treasure.
In this carrd I'll only include confirmed events + theories I'm pretty certain of, that's why a big part of the Treasure series isn't included (a lot of the info comes from the diaries but I resumed it) - as more information is released and confirmed I will add it here !
beginning of the story - Fever Part 1
into strictland - fever part 2 & 3
Text
> you clicked 'fever part 1'
zero: fever part 1
This part focuses mainly on the characters' backgrounds (if you've read the 'character' section you'll know pretty much the basics of each one).
! important note: majority of this part is set in a warehouse - the one in Diary Film (that was Ateez's hideout)
As the characters get closer and decide to follow their dream together, there's a few things that temporarily stop them: Mingi's and Jongho's fight (briefly described in the 'character' section), San's father and San having to move away again and Yeosang's father getting the boys kicked out of the hideout. The group grows distant for a while.
It was around the Summer time when Hongjoong started seeing one of the Black Pirates in his dreams. The encounter (/dream) in the warehouse (between Hongjoong and said Black Pirate) shown in Diary Film was one after many, though this time the unknown pirate gives Hongjoong the Cromer. Not long after he wakes up the warehouse's door opens as all the other members come in, as confused as Hongjoong (it's not said how / why they all went to the warehouse right at the perfect time all at once but chances are each member was either visited by a Black Pirate too or indirectly sent there).
> you clicked 'fever part 2 & 3'
zero: fever part 2
As Hongjoong has the Cromer in his hands, it flashes, indicating they just travelled to another dimension (though they don't really realize it at first) - that's when the members hear a voice outside. This is their 1st encounter with the 'white-clad giants' (or Android Guardians). The reason why they were there / how they ended up there was most likely because they were following the Black Pirate, to catch him and the Cromer.
The members manage to run away after Hongjoong throws a piece of broken glass at the Android Guardians instead of the Cromer.
note: the Android Guardians can't distinguish broken glass from the Cromer fast (so any time you see broken glass in any Ateez MV this is probably the reason why)
Since this dimension is fairly similar to Ateez's original one (visually wise), only having a few differences, the members run away safely - temporarily hiding in a forest. After staying there for a bit, the Android Guardians find them and attack Wooyoung (he was the one guarding the Cromer at the time) - the others manage to save Woo but lose the Cromer.
As Ateez escape to a nearby cave, they encounter a little girl who offers to help them and let's them stay at her house for the night - she is one of the Grimes siblings.
While staying at the house they meet her brother, he tells Ateez a bit about how their world works: human emotions were seen as a crime and therefore laws such as the prohibition of arts and the use of advanced technology to lower emotions were passed (he also mentions how his sister's voice was stolen by the white-clad giants) - though, as some time passed, the men in black fedoras appeared and, against the government's orders, started performing publicly. This caused other people to join them and so a resistance was formed: the Black Pirates.
Ateez decide to split into 2 groups: Yeosang and Jongho go get back the girl's stolen voice & Yunho, Mingi, San, Wooyoung, Hongjoong and Seonghwa go look for Left Eye (they needed to find him because he knew where the Android bunker was - and that was where the Android Guardians took the Cromer).
One of the locations in the Fireworks MV is Strictland's dump, where Left Eye works -

-- this is where one group finds him. That group decides that to figure out the location of the bunker they need to get Left Eye away from the yellow gas (that is also shown in the background of the MV) - to make him stop hallucinating.
Meanwhile the other group headed toward the cave where the girl's voice was hidden - Jongho would enter the cave with a string attached to him and a gas mask while Yeosang would stay at the cave's entry.
As Jongho enters the cave something goes wrong with his mask and he starts inhaling the yellow gas without noticing - he starts hallucinating, thinking he's in one of his past basketball games (the one where he got injured).
Noticing the string attached to Jongho had stopped moving, Yeosang runs after him getting to Jongho just in time to stop him from falling off a cliff nearby.
The Grimes girl got her voice back and both of them went back to safety.
zero: fever part 3
The other group was successful in talking to Left Eye, though it didn't really go right at first they still got to him thanks to Yunho (relating to Left Eye in his loss of someone close to him). They eventually find out the location to the Android bunker (an abandoned gallery in an island) and start heading towards it, accompanied by Left Eye and the Grimes siblings (but they stayed in the ship while Ateez went inside the bunker).
When they finally arrived in the island, they immediatly went in the gallery - the same one shown towards the end of the Deja Vu MV and in the Say My Name MV. Here stayed all art-related things the Androids apprehended, energy extracted from people, the Cromer and HalaTeez (trapped inside glass boxes - you can see the moment they see HalaTeez in the Deja Vu MV).

Up until this point Ateez had never seen the Black Pirates without their masks on - this changes when Hongjoong gets close to one of the boxes and as the pirate takes off his mask Hongjoong realizes he's looking at 'himself' (you can see this happen in the Deja Vu MV).
Ateez get HalaTeez's uniforms on after HalaJoong explains that, while they're stuck at the bunker, someone has to take on their role. Not long after this exchange they realize Yeosang is gone - while everyone was distracted he went to find and get the Cromer back.
The others run back to the lobby and Yeo actually succeeds in giving Hongjoong the Cromer; however, the guardians get to him and threaten to kill him if Hongjoong doesn't give them the hourglass. Feeling like this situation was his fault Yeosang takes it upon himself to 'fix it' - when Joong throws the Cromer at the guardians Yeosang manages to catch it, turns it and then throws it against the floor, breaking the hourglass (this is the final scene in the Deja Vu MV).

Yeosang's action actually gets the the other 7 members back to their original dimension, but he stays behind and gets trapped inside one of the glass boxes just like HalaTeez.
> you clicked 'fever epilogue'
zero: fever epilogue
The thing about breaking the Cromer is
it apparently sends you back into the past.
The 7 of them got sent back to the past, a bit before Yunho's brother's accident - this causes Yunho to want to stay here, in this past dimension.
While thinking of a way to get Yeosang back, Seonghwa finds an article talking about the attempted robbery of an artefact - the Cromer (this attempted robbery was executed by 3 members of the Sciensalvar organization [briefly mentioned in the 'character' section], this organization, led by Henry Jo, believes humans are a collection or energy and their future can be resolved by science - they also believe the Cromer is the key to saving said future).
They all decide to steal this dimension's Cromer from the museum and go back to the other dimension to get Yeosang - all except Yunho, like I mentioned, since his brother was still alive here he wanted to stay (despite being upset and saddened by this, the others respect his decision).
As they get inside the museum they see a crowd of people dressed in red and 1 man dressed in black with the Cromer in his hands - Henry Jo.
In an attempt to get the Cromer from him, Wooyoung gets too close - Henry catches him and makes him hostage so the police (who had arrived at the scene not that long ago) doesn't shoot at him.
What ultimately saves Wooyoung is a group of bikers arriving at the local - Yunho and his friends (while still at home with his brother, Yunho saw the news reporting Sciensalvar invading the museum and holding a group of boys, immediatly knowing it was Ateez he decided to leave the house to help them), in The Real's MV Yunho is shown with his motorcycle -

-- distracting Henry and the rest of the crowd.
Wooyoung is able to steal the Cromer and they all run away with the help of Yunho and his friends.
Henry is following them the entire time in his car, though they only realize when it's already too late - Yunho's brother had gotten out of the house and the accident happened in this dimension as well, only this time we know Henry Jo was the one who hit him. Yunho and his brother have a pretty emotional conversation and I'm assuming he ends up dying here as well.
Before Henry can get to them Wooyoung turns the Cromer, sending them to another dimension.
> you clicked 'treasure ep 2 & 1'
treasure ep. 2 & 1
Chronologically speaking, Say My Name is the first MV of the Treasure Series.
After returning to HalaTeez's dimension Ateez immediatly get to Yeosang - Seonghwa specifically is the one to get him out of the glass box (you can see this in the Ode To Joy Performance, the reason why Seonghwa has the Hala Hala uniform on is because, like I mentioned earlier, HalaTeez temporarily gave Ateez their uniforms).

They most likely freed HalaTeez as well and, since back in Fever Part 3 HalaJoong was the only one who took his mask off, this is probably where the rest of them reveal who they are as well (this is what's shown in the scene where HalaHwa is taking his mask off in front of Seonghwa).

note: it's unclear to me if Ateez took on HalaTeez's role and continued with their uniforms for much longer after Say My Name and HALA HALA, but I do think they switched back right after releasing HalaTeez
To let the others know of their arrival they send a morse code message to the hideout of the resistance group and Left Eye is the one to decode it:
SAY MY NAME. ATEEZ.
(the message you hear at the beginning of the SMN MV)
At the end of the SMN MV you can hear the beginning of Precious playing - this is the transition between SMN and Treasure.
After saving Yeosang they likely travelled again - this is shown in the Ode To Joy Performance as well when they zoom in to the full moon with the hourglass on top of it

and that's how they got to the desert in Treasure. This is the beginning (kind of) of their journey here, in another dimension, as they struggle to distinguish reality from dreams - though they're certain of one thing: their search for a said 'treasure' everyone wants and is looking for and also 'a place no one has seen before', utopia.