Haou no Koukyuu Tenmei no Hanayome to Hyakunen no Chouai

Princess Shi Jinli of Chengguo appeared at the funeral as the fiancée of the suddenly deceased emperor, clinging to the coffin and crying. The new emperor, Yuan Shilong, was suspicious of her, but decided to marry her after she was divined as "a celestial maiden who will bring the world to the man she loves." Meanwhile, Jinli also had her own reasons for wanting to marry the emperor and become empress...!?

(Source: Kadokawa, translated)