The age difference between Ren Xin and Li Tongguang was unclear. Files 1 and 2 mentioned that Li Tongguang was 22 years old. Files 2 and 3 mentioned that Ren Ruyi was 25 years old when she left Li Tongguang, and Li Tongguang was 17 years old. However, Ren Xin's exact age was not provided. Therefore, it was impossible to determine the age difference between Ren Xin and Li Tongguang.
The age difference between Jiu 'er and Ren Xin was unclear. The search results did not mention the age difference between Ren Xin and Jiu 'er. Therefore, it was impossible to determine the age difference between Ren Xin and Jiu 'er.
Ren Ruyi was heartless towards Li Tongguang. Ren Ruyi chose to leave with Ning Yuanzhou in the movie and never meet Li Tongguang again. Although Li Tongguang had deep feelings for Ren Ruyi, Ren Ruyi's attitude towards him had become cold and even heartless. This could be seen from the dialogue and plot in the play. Ren Ruyi chose to leave Li Tongguang and was no longer with him. Therefore, it could be said that Ren Ruyi was heartless towards Li Tongguang.
Ren Ruyi and Li Tongguang met in the 26th episode of the TV series " A Thought at Mountain Pass." Li Tongguang pretended to be an assassin to test Ren Ruyi. In the end, he discovered Ren Ruyi's Lotus Steps, and Ren Ruyi finally recognized Li Tongguang. In this episode, Li Tongguang discovered the silver needle that belonged to his master. He protected Ruyi with tears and begged his master to acknowledge him as his disciple. Ren Ruyi finally admitted her identity.
The actor who played the young Li Tongguang did not mention it.
Chang Huasen was playing Li Tongguang of Mt. One Thought.