10,000 years ago, cavewoman Qiqi obtained the ability to trade time with others and lived until the present day. Many incredible things happened in her time: A heartbroken female sculptor learnt a forbidden witchcraft to create a wooden living copy of her ex-boyfriend and imprisoned him in a basement; Wei mysteriously swaps souls with a pig and finally comprehends the depth of love from his family; an astronaut who accidentally got lost in space realized the alien creature which he set free was his only hope to return home. All of this became tales that Qiqi told to her terminally ill daughter. At sunset, Qiqi told the last story: There was a person who had a magical box that could allow one to stay in a repeating day. Qiqi wanted to take away the ill-fated future from her daughter, so that they would forever stay in the happiest today, never to be separated.
一萬年前的野人琪琪因一場奇遇獲得與他人交易時間來延長自己生命的能力，活到了現代。這萬年間發生了一些不可思議的事情，都成了琪琪講述給患絕症女兒的奇幻故事。其中最後一個故事：有個神奇的盒子，可以讓人留在快樂的一天。琪琪要向女兒買下時間，讓女兒遠離病痛，兩人將永遠留在最幸福的今天，永不分離。
