Based on the location of the Instagram video below, it looks like this is at the police training center at Asan, not Seoul.

Photos:

Changmin and Siwon for the launching ceremony for SMPA x Youth Public Order Partners. It seems it’s an initiative between SMPA and female youths to help keep public order in the community.

[cr: Photos by @0ngxxi, In English via @snxy]

Video:

Singing Balloons:

[cr:  po_shlice27: here]

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Credits:

Photos by @0ngxxi, In English via @snxy,
Videos by po_shlice27: here,
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