The following accounts are from different people who spotted Changmin with his father/family taking a walk at Seokchonhosu Lake Park. There is a Super Moon art project going on at there, so probably they were there to see it as well~

Non-fanaccount via @GoziB_37:

Today, two people posted online that they saw Changmin walking with his father at Seokchonhosu Lake Park ;;

fan’s acquaintance said changmin was really handsome too and s/he took another look and quickly contacted the fan.

From a member of public’s Instagram (1ammaji):

– s/he encountered changmin (wearing a cap) walking with his family at seokchon lake~

Last account via @218206:

Translation:

Posted by a friend of someone who saw Changmin at Seokchon lake-
as he’d really looked like Changmin, the friend approached him when there was no one around, and said “by any chance, are you..” and Changmin promptly went “shhh”. The friend also said his (body) figure was good.

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Credits:

Non-fanaccounts via @GoziB_37: 1 + 2, by 1ammaji, and via @218206,
All Translated by @snxy: 1, 2, 3, and 4,
Super Moon art project info via @snxy,
Shared by TVXQ! Express