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李詩情夢見她乘坐的45路公交車，在走向跨江大橋時爆炸了，她也因為爆炸被嚇醒。醒來後她發現公交車上的經歷居然和夢境一模一樣，在多次努力嘗試阻止爆炸未果後，確信自己進入了時間循環。與此同時，第六次時間循環時被強行拽下車的肖鶴雲也和李詩情一起進入了循環。兩個普通的年輕人在一次又一次的循環中，經歷了生死挑戰，實現了自我成長，也瞭解到了45路公交車上身份各異的乘客們背後的故事。最終在二人和警方的共同努力下，終於尋找到了爆炸的真相。正義終會來臨，正如倆人名字所預示的那般，迎來“晴空一鶴排雲上，便引詩情到碧霄”的清朗開闊。

Li Shiqing dreamed that the No. 45 bus she was riding on exploded on the way to the cross-river bridge, and she was also awakened by the explosion. After waking up, she found that the experience on the bus was exactly the same as the dream. After many unsuccessful attempts to stop the explosion, she was convinced that she had entered a time loop. At the same time, Xiao Heyun, who was forcibly dragged out of the car during the sixth time loop, also entered the loop with Li Shiqing. Two ordinary young people experienced the challenges of life and death in repeated cycles, realized self-growth, and learned the stories behind the passengers with different identities on the No. 45 bus. Finally, with the joint efforts of the two and the police, the truth of the explosion was finally found. Justice will come eventually, just as the names of the two of them herald, ushering in the clear and open sky of "a crane in the clear sky will lead the poetic sentiment to the blue sky.