It is Ling Tianya (4)

"In the end, it was only when we arrived at the mansion that we found out that Sister Tianya had been kidnapped. The Ruan Family members kept it a secret from Grandmother because they were afraid that she wouldn't be able to bear the shock. Yesterday, they told us because they no longer could keep it hidden. In the end, Grandmother really couldn't deal with the shock, and she immediately fainted and was sent to hospital." Yu Luoluo summarized everything that happened to Cheng Chen. "Yesterday, they kept trying to save Grandmother. Afterward, Madame Ruan and Aunty Wang came and from them, I learned that my sister had been kidnapped."

Yu Luoluo repeated everything she had been told by Madame Ruan and Wang Yazhi to Cheng Chen.

This included how Ruan Guosheng had collaborated with the KSI and how Zhang Ke was a hidden chess piece who kidnapped Ling Tianya.

As she spoke, Cheng Chen's forehead deepened.