When did the legendary sword and Fang Lansheng know about Sun Yueyan's past life relationship?

After the story of Zi Ronglin, I returned to Qinchuan. Fang Lansheng was brought to the saying by Nanny Sun. The first time she saw Sun Yueyan, she thought of He Wenjun. After talking, they learned that Sun Yueyan was told a fortune, saying that she lost a soul and a spirit when she was reborn in her last life. This is consistent with what Fang Lansheng saw after seeing Ye Shenxiang's ghost in Leisure Villa and what Ye Shenxiang said to him. So I knew that Sun Yueyan was the reincarnation of He Wenjun.