The last person to call Cao Xiaoqiang was Xu Ruoyun. Although Xu Ruoyun was not the heroine, he was the only woman Cao Xiaoqiang truly loved besides his first love. There is also a small detail in the play that shows that the person calling Cao Xiaoqiang is Xu Ruoyun, because the background music when Xu Ruoyun appears is the same and has not changed.

When he heard someone calling Cao Xiaoqiang, Cao Xiaoqiang turned around. He was surprised at first, and then smiled. From this small detail, we can know that this woman must be A person that Cao Xiaoqiang likes very much. In fact, when Xiaoqiang and Xu Ruoyun were dating, the two were a perfect match in many aspects. Their views were consistent and their spiritual pursuits were in perfect harmony.

However, because Xu Ruoyun was very successful in his career, and Xiaoqiang was down at that time, it was also for this reason that the two did not get together. Now that Cao Xiaoqiang has successfully started his own business, his career can completely match that of Xu Ruoyun. And when Xu Ruoyun, who went abroad to develop, comes back, the future of the two of them has unlimited possibilities.

In addition, when Xu Ruoyun left, she told Xiaoqiang that she didn't know if she would have the ability to love again in the future. This shows that when she has the ability to love, she will still come back. Therefore, the person named Cao Xiaoqiang at the end must be Xu Ruoyun.