It seems like Changmin dressed again as the Policewoman mascot Posuni for another Children show. This time though her brother, Podori, was played by Siwon~

https://www.instagram.com/p/BFiI-KXAT18/

English Summary:

While watching the kids’ mascot show (for anti-child violence) where the teachers were secretly more excited than the kids. Podori and Posuni were Choi Siwon and Choikang Changmin while the MC was Donghae.

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Credits:

eunnii_92,
Translated by @snxy,
Shared by TVXQ! Express