SISTAR's Soyu revealed that Seohyun is not as closed off as she had initially thought while�Heechul�revealed that his favorite idol vocalist is Taeyeon�on the October 7 edition of OnStyle's 'THE TaeTiSeo'.

This week's episode of 'THE TaeTiSeo' featured close idol friends of the girls. Taeyeon, Tiffany, and Seohyun were seen busily preparing for their guests to arrive with sweet desserts. Seohyun had invited SISTAR's Soyu, Tiffany invited Bora, and Taeyeon called over Super Junior's Heechul as her close friend.

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Soyu then revealed that she always thought Seohyun would be a bit closed off but that was not the case as Seohyun first approached her brightly.

Also on the episode, Heechul revealed, "I like Taeyeon's voice. When someone asks me who sings the best out of any girl group, I pick Taeyeon," and proceeded to�imitate�Taeyeon's singing.�

Soyu then sighed as she said, "So lucky. When someone imitates me, they make hoarse sounds."�