OP spotted Yunho at a restaurant, Soosa, in Uijeongbu {t/n: posted on 5/4 so it means OP saw Yunho on 5/3}:

That’s right. Yesterday I went to Soosa in Uijeongbu and saw U-Know Yunho.
He is really tall and his face is small ㅎㅎ
His body proportions are good.
He was eating (his food) well as I saw him from up close.
Though he was wearing a black mask when he came, he was exactly like a celebrity (i.e. the feel) ㅋㅋ

About the restaurant:

Soosa is a sushi buffet place 수사 의정부센트럴타워점 (출처 : 네이버 플레이스)http://naver.me/5oFR0Pvw 

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Credits:

LEE @ naver blog via TVXQ_86268818,
Translated by @snxy,
About restaurant by @snxy,
Shared by TVXQ! Express