Scarlet Heart
Episode 13 (1x13)
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Afraid that Yinsi will meet a horrible fate, Ruoxi forces Yinsi to choose between his ambition and her love. Ruoxi does so with knowledge of the future, knowing that Yinsi will die in prison after Yinzhen seizes the throne after Kangxi's death. However, Ruoxi does not know if her actions then could change history. She and Yinsi do not meet each other for days until they return to the capital.