Scale Bearer in Underworld

She was once the protector princess of Dazhao. She used her soul as a salary and stayed in the underworld as a pawnshop forever in exchange for the dynasty's four hundred years of respite. For four hundred years, she burned herself to purify the country and eliminate her sins, but she forgot who she was. Until the old lieutenant Shi Jin brings the truth: everything she protects has long been rotten to the core. When the last emperor pawned his final destiny, memory and pain returned together. She finally understood that she was the requiem chosen by history, and she would use eternal loneliness to sing the last song of the eight hundred years of rise and fall.