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I don’t know it was only the season 2 that BWAT spoiled. Wait let me paste the post here
Season 1 mainly covered Tae's perspective.
Season 2 will focus on why Shuraka became the greatest tyrant in Arnata history, the one who made the current era known as the "Age of the River of Blood"
... In other words, Shuraka's perspective will
take center stage.
Within this year

Ok I just read BWAT's post. She said the season 2 will focus on Shuraka's perspective and the 12 years past when Tei wasn't around and how Shuraka became the most tyrant Emperor in history of Arnata that became known as the River of blood era. So we can expect flashbacks of 12 years of fight for throne in season 2