This is part of the SMPA campaign to encourage people to report cases of child abuse. information on the event as follows:

• take a proof shot with the phone installation at sejong theatre-
• post shot on official event SNS and stand to win phone battery chargers; USBs; vouchers etc 9/8-12
• results 9/13

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Credits:

서울경찰 (Seoul Police): here,
Even translated by @snxy,
Shard by TVXQ! Express