Why didn't Li Dan come before? As far as I know, Li Dan has not returned since he bid farewell to the Oddity Theory in June 2020. The specific reasons are not clear, but the guesses may include the following: 1. Personal reasons: Li Dan may have some personal matters to deal with or he wants to focus on his own creation and career development. 2. Program adjustments: Oddity Talk may make some adjustments and changes based on audience feedback and market demand. It may take some time to adapt to the new rules and competition format. 3. Program Recording: Li Dan may not be in the recording period of Oddity Talk or he may need to participate in some other programs or activities. Only Li Dan knows the specific reason for his return. We can only wait for him to publicly reveal it.