OP was looking through old pictures in her hp when she found this with Yunho

Translation:

The days of being a Cassiopeia, TVXQ fan in the pastㅋㅋAs it was (OP)’s first time, as a rookie, shooting as a model for an advertisement, it was really heart-thumping (excited)~~ at the time, despite having to shoot through the night at a young age, (Yunho) was undeterred and professional, his manners were good and his body length wad good ♡

The advertisement op refered too is probably the one TVXQ filmed for Shilla Duty Free in 2011 as the styling looks similar~

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Credits:

sjmoms at cafe naver via @TVXQ_86268818 and @Shim_Ls2v2
Translated by @snxy,
Post Writtedn and Shared by TVXQ! Express