Looks like a couple shirt at first glance? According to Amber, it was just a coincidence.
On August 9, f(x) Amber revealed a photo taken with EXO Kris on her instagram account. The two posed acting awkwardly to each other as Amber captioned,
"Two people who accidentally wore similar clothes today.. Awkward.. Thanks for 1st place on MB!". Fans who saw this photo commented, "Why not KrisBer?","That was funny Amber!","I like this photo and I like the shirt!","These two are so adorable," and so on.
Meanwhile, f(x) won Music Bank's K-Chart against BEAST on August 9.