Fly to the Sky performed in perfect harmony on the September 9th '2014 I Am a Singer' Chuseok special. 

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The vocal duo sang their hit song "Missing You" as well as Kim Kwang Suk's "Though I Loved You". Member Hwanhee joked before their performance, "There are two of us so if we're last place, it'll be embarrassing." The two also mentioned that they'd both been a bit sick, and they were nervous about doing well on stage.

For the first round, Fly to the Sky's "Missing You" was sung in perfect harmony, and the crowd was amazed at how their voices never wavered at the high notes. Their cover of "Though I Loved You" for their next performance was also a hit with the audience as they transformed it into their own R&B style.

Despite Fly to the Sky's amazing performances, The One was voted the top singer.