Two people who don't believe in love establish a comradeship and soul resonance that transcends love in a conspiracy.
The deposed crown princess came back from the dead, gave up on love, and took the initiative to cooperate with the "treacherous eunuch" who would wield power in the future. She helped him clean up the court, and he became her sharpest knife. The two embraced and killed each other at the peak of power, but found that each other's fate had been intertwined earlier.
"The reborn abandoned concubine formed an alliance with the future treacherous minister, turning the entire dynasty into a chess game, and staged an ultimate black-on-black, two-way redemption."