Girls' Generation appeared on 'Beatles Code 3D' on March 18 and member Hyoyeon talked about her training period at SM Entertainment.  

It turned out that she started very early at the age of 12, while Taeyeon joined in 2004, Tiffany in November of 2004, and Sunny in early 2007.  Hyoyeon said, "Even the TVXQ oppas came after me. This was before BoA debuted and when H.O.T was active," surprising everybody with how early she was put into the training program.

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It was also revealed that Hyoyeon's mother was a huge H.O.T fan, which is how she got signed with SM Entertainment. Shin Dong Yup brought up, "One of H.O.T's fans is Hyoyeon's mother." She said, "That was one of the opportunities I got. My mother got a phone call. They said they were H.O.T's company, so my mother said she'd take me to the audition."

Lim Chang Jung, who was also a guest, said, "She planted you there so she can see them often," making everyone laugh.