Bad Deeds Of The Terminally Ill Empress summary:

It was an arranged marriage, but it was her first love. I loved him not because he was the Emperor, but because it was you. In a wheelchair, Stella dedicated herself to the empire and her husband. However, what came back was a cruel death. The goddess Eunsaji returned Stella, who died paralyzed, and chose her childhood friend in this life as well. Looking at her husband, Stella impulsively took a gladiatorial slave.