Sekkahiden: Rantei Koukyuu Shimatsuki

"This girl will one day harm the king." Song Lingxue, having received this prophecy, was supposed to end her life in a quiet temple. However, her fate was turned upside down. She was forcibly taken to the capital by the king—and made queen. But Lingxue, bewildered and weeping uncontrollably, was banished to the detached palace. Time passed, and when she turned nineteen, rumors spread that the cause of the king's heir's death was a curse. To dispel the rumors and uncover the truth behind the series of deaths, Linxue is brought back to the harem. Thrown into a world swirling with intrigue, the beautiful and intelligent Linxue, who had been in the detached palace, finds herself in... (Source: Kadokawa, translated)