When the moon's light left her, Olivia was sent into exile. When the light shone on Vivi, she was forced to leave her home and join the people of the moon. Now the light shifts, shining onto twelve people, two of them outsiders. The others still struggle with past mistakes and grudges. All while a new threat approaches from the future. 

Vivi and Haseul are roommates. With a few benefits.

“Most of my body is synthetic,” the queen said. “It has been for about five years, which includes my brain.” Viian tapped her head, before pointing at her eye. “We were at negotiations with Kepler and someone took the opportunity to place a virus in my head.”  In other words, Haseul is a hacker who got caught, and her chance at freedom is helping Vivi, the queen, who's also an android, get a virus out of her head.