Are there really swallows and crape myrtle in history?

No, Wei Zi and Swallow are fictional characters in the novel. Adapted from Qiong Yao's novel of the same name. The first and second films were directed by Sun Shupei and Li Ping, written by Qiong Yao and co-starred by Zhao Wei, Ruby Lin, Alec Su, Fan Bingbing and Zhang Tie-Lin. The Third Part is directed by Li Ping, written by Qiong Yao and co-starred by Ku Kuiji, Huang Xiaoming, Rebecca and Ma Yili. The play tells a story that is difficult to distinguish between true and false.