To escape her elder sister's scheme to make her marry in her place, Chu Luo has no choice but to take Chu Yuning's place and marry into the Eastern Palace, where she must face the unpredictable Crown Prince Yin Chifeng, infamous in rumors. Seemingly isolated and without support, Chu Luo can only plan carefully at every step and use her intelligence to overcome each crisis. As the two repeatedly test one another, she searches for a way out while gradually uncovering long-buried secrets surrounding the Eastern Palace and the Chu family.