Liu Sisi was played by Yu Xinlei.
Liu Duanduan was an actor, singer, and music composer from mainland China. He graduated from the Central Academy of Drama with a bachelor's degree in performing arts and worked at the National Drama Theater of China. He had acted in many plays and TV series, and also acted in the movie Embroidered Spring Sword 2: Asura Battlefield. Liu Duanduan was highly regarded in the entertainment industry and his acting skills were highly praised. However, there was no specific photo information in the search results provided. Therefore, Liu Duanduan's photo could not be provided.
We can conclude that Liu Duanduan is an actor, singer, and music composer from mainland China. He graduated from the Central Academy of Drama with a bachelor's degree in performing arts and worked at the National Drama Theater of China. Liu Duanduan had starred in many plays and TV series, including Red, Red Rock Soul, Smiling Face Man, Chopin, etc. He also acted in the movie Embroidered Spring Sword 2: Asura Battlefield and the TV series Celebrating Years. However, the search results provided did not directly include Liu Duanduan's photo. Therefore, I am unable to provide Liu Duanduan's photo.