Yoona said;''Oppa, please stop turning red at the ears!!! Really!!!"
That's the direct translation.

She's annoyed that his ears turn red everytime he talks about her with other members..or does something for her .. you know how taec's ears are his "truth detector"....so every time he is affected by yoona..his ears turn red.....

I think yoona feels his ears are a dead giveaway of his feelings for her - fanning all those loveline rumours..... haha....but...

Well here's a song to brighten up my boredness

Taec yoona looks l;ike they are on a date

Taec patting yoona's back ;D