Which one comes first, Octo Expansion or the normal campaign?

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I play Splatoon 2 and the original and was wondering about the question above, which one comes first in the timeline.
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Is Octo Expansion a prequel?
The Octo Expansion adds an entirely new single-player campaign that consists of over 80 levels. The story is a prequel and takes place sometime before the events of Splatoon 2's Hero Mode with a slightly younger Pearl and Marina.Is Octo Expansion a sequel?
Splatoon 2: Octo Expansion is an expansion pack to the single-player mode of Splatoon 2, a third-person shooter video game for the Nintendo Switch....Splatoon 2: Octo ExpansionDeveloper(s)Nintendo EPDPublisher(s)NintendoDirector(s)Yusuke Amano Seita Inoue Shintaro SatoProducer(s)Hisashi Nogami7 more rowsDo you have to finish Octo Expansion to play as an Octoling?
To unlock Octoling complete the main story of Splatoon 2 Octo Expansion. Octolings will not be available until you are done with the campaign. Only after finishing the expansion, you can play as Octolings in Splatoon 2. Just beat the game and unlock any ending to unlock the characters.How many levels do you have to complete to beat the Octo Expansion?
In the Splatoon 2 Octo Expansion, there are eighty levels to conquer, all corresponding to a different station on the Deepsea Metro. There is, however, a way to fast-track straight to the ending and get the ability to play as an Octoling.IL BOSS SEGRETO (100%) - Splatoon 2 Octo Expansion ITA #08
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