Private 2nd class Jung Yunho was the narrator for the White-hat Hacker contest congratulatory video. There are other SM artists who appeared shortly.

https://www.youtube.com/watch?v=3wl7ZbYhGI4

“White-hat Contest” is an annual contest jointly hosted by the Defense Ministry and the National Intelligence Service (NIS), and supervised by the Cyber Command. It is a contest to select the best white-hat hackers to fight cyber terrorism began Monday. Its awards ceremony took place on Oct. 26.  (cr: koreatimes via @snxy26)

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Credits:

SUBIN KONG and koreatimes via @snxy26,
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