Girls' Generation member YoonA is known for her unique aegyo, which fans love. But perhaps her aegyo isn't fail proof as we thought in charming the guys?

In the latest episode of 'Channel Girls' Generation', YoonA was given a very specific mission. Her job was to hear the words, "Why are you so cute?" from someone through the phone within one minute.

YoonA complained, "I really have no one to call." Some suggestions thrown at her were Super Junior's Heechul and Shinhwa's Eric, but who did YoonA end up calling?

Once the call went through she asked in a total baby voice, "Oppa, how am I?"

After a slight pause, the guy replied, "I'm going to hang up," making YoonA and the other members laugh.

She tried again and said in her baby voice, "Oppa, I had a ghost dream," trying that popular baby aegyo trend (if you have no idea what that is, check out the article here).

However, the only response she was met with was, "Are you drunk? What the heck are you doing!"

He later caught on that he was supposed to be saying something specific to her, but he just remarked, "I've done a lot of broadcast, but this, I don't know what the heck you're doing," frustrating YoonA as the other Girls' Generation members laughed.

Well it turns out that mystery guy on the other line was none other than Super Junior's Eunhyuk! When Sooyoung explained to him that YoonA's mission had been to hear the words "Why are you so cute?", Eunhyuk exclaimed, "Then she shouldn't have done it like that. Honestly, it was quite frightening," explaining that YoonA's aegyo was more frightening than cute!

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You can see the clip above or watch the full phone conversation at the 24:45 mark below!