Somewhere else in the Luvile Universe, Shinja, Yusa, and Lofa were cultivating in the frozen Planet that Shinja's Master, Lua, introduced before. The Planet of Zalein. (Refer to chapter 186)
Shinja had got permission from Lua to bring the other two here. Just like her, Yusa and Lofa also specialize in Water Element. This Planet was also the one with a big hole that led to the Planet's core. As mentioned before, this Planet was different from the normal ones. Its core had long since died, and the deeper you went, the colder it got.
Shinja was cultivating at a distance of 150km down, while Yusa and Lofa were at 100km or so. Lua had mentioned that the right distance for Soul Forging Realm is around 80km. Still, due to their Elemental Meridians, Yusa, Lofa, and Shinja could go way further. Especially Shinja, who has a Pure Yin Body.