When My Stepsister and I Moved in Together We Became Lovers.

Chu Chao and Mu Yin were originally from two different worlds. The breakdown of their families made them hate "home". Mu Yin's mother married another man and had a daughter - Chu Chao. They became stepsisters, and Chu Chao transferred to Mu Yin's high school and became roommates. The Chu Dynasty gradually fell into decline while getting along with Mu Yin... Purpose: Inspirational mutual salvation