If you were given a chance to do it again, would you dare to say those "words" that you had never said before?
Li Yan and Yang Xiaohan, a pair of graduate students at Kyoto University. Li Yan is straightforward and impulsive, while Yang Xiaohan is rational and calm. After a fierce quarrel, Yang Xiaohan decided to leave, leaving Li Yan full of regrets.
However, a meteor that pierced the night sky and a mysterious "retrospective" choice sent Li Yan back to the beginning of Yanyi's acquaintance. She is cautious, trying to make up for her mistakes and change the future. But fate seemed to have made a huge joke - instead of returning to the peaceful campus, they were thrown into the war-torn Shanghai of 1936.
From the laboratory to the rain of bullets, from the youth on campus to the life and death dependence on the intelligence front, they support each other and grow together in troubled times. While the war was still going on and she encountered a time and space dislocation, Li Yan returned to the modern city of 2023 alone, only to find that all traces of Yang Xiaohan had disappeared in this world. She must rely on the tenacity she experienced in the Republic of China to find that close friend in the vast crowd who may exist in another parallel time and space.
This is a story about regret, courage, growth and cherishment. Time always tears us apart, but we always meet again. It uses an incredible journey through time and space to tell us: The most fantastic adventure may be to give us the wisdom to manage the most ordinary but most precious life now.
