Zhao Nanxiao is a bridge designer of a certain bridge design institute, and Xu Shu is a civil BIM engineer who has returned from studying abroad. They are one year younger than Zhao Nanxiao. The two met in junior high school. Zhao Nanxiao is a good girl with excellent character and learning. Xu Shu is a rebellious young man who has just returned from abroad. Because he has a crush on Zhao Nanxiao, he is determined to take her ideal as his own and strives to make progress. Shu concealed his feelings. On the eve of graduation, Zhao Nanxiao broke up the engagement, Xu Shu went abroad, and the two broke up. Four years later, the two met again because of the bridge, and met at the construction site of the bridge.