mparthur:
In the novel, in their previous life, Song Mo and DZ took a refuge at a squire's house but they never greeted each other.
In the morning, SM encountered DZ's daughter and he said he was on his way to the temple to pay respect to his sister. Who is he referring to? His maternal cousin sister who committed suicide following the fall of the Jiang's family? I think she was the one because Song Mo decided to marry her so that she could be excluded from the Jiang family's arrest.
Song Mo had a SISTER, the daughter of Madam Jiang, his mother. Bcos of Song Yichun and Song Han, she died and Song Mo knew it too late. But thankfully in the current lifetime, Dou Zhao found out about this sister and told Song Mo about it. Song Mo sent Chen Jia to save her. He gave her a new name, Jiang Yan and she lives in his mansion as "cousin". The couple introduce her to Song family relatives and they all acknowledge her as Madam Jiang's daughter.
All of female members of Jiang family committed suicide in the first lifetime. While in this lifetime, his mother asked Song Mo to marry his oldest cousin, but she commited suicide after her boyfriend died.