Hirose recounted that while seeing Shinohara manage two very different roles, she was very inspired by her great acting and felt like like she was looking at two different persons. This led her to resolve to improve her acting so as to do something like this one day. As Migusa is the only innocent and bright character in this emotionally-heavy drama, the staff decided to choose Hirose to play the character due to her cheerful image.
During the filming at Taiwan and Japan in August, Hirose revealed that she had a lot of fun chatting with Shinohara when they took the flight home. She praised Shinohara for being someone easy to talk to and it was very comfortable to spend time with her. In response, Shinohara said that Hirose's cheerfulness was a great help to her during the filming period.