Here's Zhang Jingyi, his co-star from that movie Again and Again, which I don't think has been released, who was asked about acting with Tan Jian Ci.
https://x.com/tiff_ilosophy/status/1715644203546664999?s=20
zhang jinyi: it was quite good to collab with tan jianci because i think he's also an extremely conscientious actor. we would run through scenes together on set and help stimulate each other to give better reactions
q: how do you stimulate each other? (the media )
zhang jinyi: we would gradually grow more familiar in the process, slowly getting into character and getting to know the personalities of each other's characters
Sometimes, these translations ... I too want to know about the stimulation, reporter asking the RIGHT questions.