Yunho appears at 00:07, and 01:08.

as part of a non-profit campaign to encourage public to vote in the upcoming presidential elections in May

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EDIT: 

• Question/Text on screen at 00:07: Please vote for Yoo Jae Suk (famous MC) as president.
  Yunho: I know hyung well but as a presidential candidate? /flustered/

[cr: Translated by @snxy: here]

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Credits:

중앙선거관리위원회,
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