Oh, in a strict sense, the Saints don't belong to the Dark Side of the Empire.
The home planet of the Saints is actually located in the Holy Territory of the Empire. It's just because of the Seven Star Corridor that they ended up fighting on the Dark Side, maintaining the corridor's stability.
In the Dark Side of the Empire, especially in the Eastern Cosmos Domain, there are actually two founding legions' home planets.
The first is the Phoenix Legion.
These are old acquaintances, not only were they the initial legion of the Alliance, the parent legion of Phoenix, but during the Iron Armor War, they fought alongside the Alliance. Gu Hang has saved the life of the Lord of the Phoenix, Su Lie, and his whole legion.
The relationship between both parties can be said to be quite good. After Su Lie was promoted to represent the Interstellar Warriors, becoming one of the High Lords, he continuously provided political support to Gu Hang in the Imperial Supreme Council.
