• Siwon arrived at the cafe where op’s friend is working part-time – he used changmin’s card to pay and left ㅋㅋ
• OP stated in a reply to a question from someone, that it seemed siwon went by himself, not with changmin. It was a cafe near the police HQ

{t/n: card security’s basically non-existent in korea- you can use anyone’s credit cards and the shopkeeper themselves can even sign for you.}

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Credits:

fanaccount by @naS2yeah,
Translated by @snxy: 1, 2, and 3,
Shared by TVXQ! Express