The biggest challenge of making this film is that each actor has to shoot the dialogue separately on a different continent but edit it later as one continuous conversation in this story. Role of Sara, it was shot in Hungary not China, Actress Ai Wan recorded her performance of the whole film without anyone feeding her lines in Chinese off-camera. At the time, she couldn't find anyone who speaks fluent Chinese in her area. Due to the pandemic, she has been stranded in a small town called Tatabanya with a 60k population since Feb2020. This town is about 45 minutes car ride from the capital Budapest in Hungary.