On the October 13th Song Dae Kwan special of 'Immortal Song 2', f(x)'s Luna covered the legendary singer's song "The Day the Sun Rises".

Luna was especially emotional the day of her performance because of a letter she received from a deaf viewer, who wrote: "Though I can't hear the songs, I'm feeling the stage through your expressions." This was her final appearance on the show, so she also revealed that she prepared a special performance for the viewers.

Unable to hide her nervousness, Luna stated, "I practiced very hard a few hours every day."

Luna started her performance in front of a piano, and then moved to the center of the stage to translate the lyrics she sang into sign language, moving the audience with her thoughtful gift.

Take a look at Luna's rendition of "The Day the Sun Rises" below.