Yan Chu, the eleventh princess of Nanmo, is sent far away to Beiming for a political marriage to investigate the cause of her mother's death. She initially plans to use the emperor's favor to gradually get closer to the truth, but unexpectedly encounters Lu Yan, a tyrant feared by everyone. She conceals her abilities and pretends to be obedient, but he is convinced that she is deliberately playing hard to get. She only wants to win his favor and use him, yet he repeatedly stands up for her, openly displaying his special affection for her in front of everyone. Until palace rivalries, hidden schemes within the imperial court, and the old case surrounding the late empress all come to light at once, the two finally realize that in this marriage alliance, the truly dangerous thing has never been love, but the truth hidden behind imperial power.