Not Prince Consort Material

The day of their wedding, she plots his death.

'She', a hedonistic young master from the 21st century reincarnated as an emperor's only daughter and pampered her whole life until an imperial decree from her father commanding that she marries a no one.

Wherein an allegedly lesbian princess is forced to marry a general's sickly second son who turns out to be someone who calls white black, black white.