In the TV series "Blood Suspicion", two actors were used to play Xing Zi's mother because of the script setting and the need of the plot.

In the play, Xing Zi's mother is portrayed as a strong and gentle character. In this case, using two actors can better express the complexity and versatility of the role.

In addition, another reason may be to let the audience better understand the psychological changes and emotional development of the role. Through the performances of the two actors, the inner world and emotional state of the character can be more deeply displayed, and the audience can have a deeper understanding of the character and behavior of the character.

Generally speaking, the purpose of using two actors to play Xing Zi's mother is to better show the image and emotion of the role and improve the audience's experience of watching the drama.