Uzuki is a girl who can see the spirit of the dead = ghosts. A warrior named Liu Yongkoku appeared before her.

In this life with only three years left, I’ll live as I please.” Queen Kartia was stripped of her position and the king’s love by a concubine. Living each day in neglect, she eventually succumbed to illness, ending her life full of regret— —or so she thought. Somehow, time has turned back three years!? If she’s destined to die of illness again in three years, then this time, she’ll live for herself! With that resolve, Kartia urges her own dethronement and gains her freedom. Then, one day, the chancellor of the neighboring Aizen Empire visits her. He offers her a proposal— to become the emperor’s “decorative queen”, in exchange for her freedom and a life untouched by politics… https://www.cmoa.jp/title/311444/

"It would be better if you died," the servants' conversation pierced Queen Katia's heart as she lay ill. The king's affections were now directed towards his concubine, and all that was required of Katia was to perform her duties. Was this the result of dedicating her life to him...? Filled with regret, Katia ended her life, but when she awoke, time had rewound three years into the past!? She had been given a second life, but if things continued as they were, she might die from illness again in three years. If she didn't have much time left, she would live for herself! With that decision, Katia decided to throw away her position as queen and enjoy her remaining three years of life, but— (Source: AlphaPolis, translated)