Is Lu a daughter?

No, the story of "This Life is the First Time" shows that in 2020, Lu is a single mother and Lu is Dai's husband, born in 1993. The two are immediate family members, not related by blood, but their daughters. For the first time in my life, the story jumps to three time and space periods. Also in the maternity hospital, stories about fertility, marriage, career and family revolve around three couples.