There could be multiple explanations. Maybe it's to protect someone or achieve a greater goal. Or perhaps there's a misunderstanding that's led him to act this way.
The 'What Are You Doing Duke' manga and its adaptations are quite similar. Some adaptations might add or cut a few scenes for better flow or to meet the requirements of the specific format, but the main plot and characters stay intact.
The Case of Di Gong of the Great Tang Dynasty was an ancient mystery drama adapted from a novel of the same name. The drama was set in the prosperous Tang Dynasty and told the story of Di Renjie solving a series of bizarre and mysterious cases. The play showed the social appearance and magnificent scene of the prosperous Tang Dynasty, and portrayed the classic image of Di Renjie from many angles. The production team had put in a lot of effort in the selection of materials, actors, costumes, props, and other production links. However, even though the show had finished filming in April 2022, the search results did not provide any information on why it had been delayed. Therefore, there was currently no answer to the question of why the case of the Great Tang's Duke Di was missing.