I don't know how many teaser pics SM has released for Super Junior M's come back. But in this one, Eunhyuk was spotted wearing the same shirt as Zhoumi but in different colour. Eunhyuk wore a white one, meanwhile Zhoumi chose the black one. They are coming from Givenchy Men collection.
I've tried to find the buy link, but I think it's sold out everywhere. By the way, this shirt's called White Shiny Bead Star Slim Fit Poplin Shirt.