This group covered in 2013:
>> 15&
>> Jevice
>> 2Yoon
>> Dasoni
>> Infinite H
>> Taeyeon and Tiffany
>> Jessica and Taeyeon
>> Jessica and Tiffany
>> Sunny and Sungmin
>> 2Ye
>> Taeyeon and The One
>> Any other duets
>> Jevice
>> 2Yoon
>> Dasoni
>> Infinite H
>> Taeyeon and Tiffany
>> Jessica and Taeyeon
>> Jessica and Tiffany
>> Sunny and Sungmin
>> 2Ye
>> Taeyeon and The One
>> Any other duets