Seohyun joined MBC′s Infinity Challenge to help out a former idol. Eugene is stepping down from her spot on the show to go on maternity leave. While she settles down to give birth to her firstborn, Girls' Generation member Seohyun agreed to fill in.

The "Mr. Mr." singer will perform alongside Eugene's former S.E.S members Bada and Shoo on the "Saturday, Saturday is for Singers" (S.S.S) show.

"Recently, Seohyun received an offer from the Infinity Challenge staff. She decided to appear," her rep told Newsen today.

After practicing S.E.S's songs, she is scheduled to perform at the December 18 S.S.S concert at the MBC Dream Center Open Hall in Ilsan.The show will feature idol stars from the '90s like Sung Mo, Cool, Jinusean, and Kim Hyun Jung. More singers are expected to confirm their appearance soon. 

Watch Seo In Guk and Shin Sung Rok use face reading to place a rightful king on the throne in The King’s Face:

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Do you think it was sweet of Seohyun to agree to fill Eugene's shoes for awhile? 

Shelly M is an author and blogger. Follow her personal blog at