Yang Mengying is Lin Yu's daughter.
Lin Yu's husband is surnamed Yang and also came from the Republic. Comrade Yang, in his childhood, once suffered from the malignant cancer, leukemia. Although he eventually recovered and stopped taking medication, the cancerous cells in his body are certainly higher than those in a person who never had cancer. This posed a significant risk of recurrence of malignant cancer if he underwent the "immune destruction" surgery.
This enormous risk made him give up on the Standardization Modification Surgery.
Lin Yu being able to meet him was, in some sense, quite fortunate. In this era, a pure-blooded Homo sapiens faces quite narrow prospects in choosing a mate. While Homo sapiens and Benchmark Men share the same personality, their physical conditions differ greatly. Just a momentary warm touch between them poses a risk of low-temperature burns for Homo sapiens.