My fate has been decided~

Spring has started. But still Yue hasn't confessed her love to Kai. Last day of her high school. On her way to school, Yue sees a guy alike Kai in middle of the road. When she rushes to see him, a cat from the tree fell into her arms and made her kiss him. But also made them fell into Jin Dynasty, by mistake. They both are alone in that place. Yue tries to befriend with him but he refuses and he starts being rude and mean to her. Yue started to hate him. Walking with him in this lonely place makes her feel awkward. While walking to a distance, Yue hears many voices like "You don't deserve to marry Kai". " You're the worst". Confused Yue meets Lufan. Lufan is Yue's childhood friend, they both grew up in the palace. She is the princess of Lu clan. She is the one who poisoned Yue in the welcome drink arranged by Kai. Lufan secretly has a crush on Kai. After the death of Yue, Kai gets depressed. Lufan tries to take Yue's place and even tries to seduce him, but all her efforts were fail. One night, Kai stands in front of a pond and stares at the night sky. Suddenly he hears a voice. That voice states "Kai, I'm Sora Matsuda your guardian. I will give you a chance to marry the future Yue. Use it wisely". When he turns around to see where the voice comes from, he finds a cat in the ground transforms into a human. Kai replied "No, I don't want a chance to marry Yue again, cause I can't and don't want to marry the future Yue, cause the one who I truly loved is dead. I don't want a replacement of the same thing. Sorry! Sora" said to Sora while crying. After a month Kai participate in the war, even Lufan does the same too.. since her parents forced her. They both die in the war zone. Sora also dies, because he failed to fulfill his master's wish. So, Kai, Sora and Lufan from the future are teleported to the past..... (and the story starts now)