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She, an ordinary girl who couldn't be more ordinary, he was aloof and arrogant. They were two parallel railway tracks, but they fell in love because of a fatal encounter. She saved him and he harmed her. What was the fate? He seeks her and she forgets him. When they meet again, he vows never to let go of her hand again, but can the wheel of fate really be so smooth?

It tells the story of Yuan Ya, a little girl with autism who accidentally meets the little monster Cassoni in the forest. Yuanya started a wonderful time travel with Cassoni, and Cassoni cured Yuanya. Yuanya became cheerful, but later Kasoni left without saying goodbye. Yuanya searched for Kasoni everywhere. When Kasoni was dying, Yuanya found him deep in the alley. Yuanya hugged Kasoni tightly. Kasuo turned into a group of butterflies and flew away at the last moment of Ni's life. Yuanya also became a strong and cheerful girl.