Luna touched the heart of many through her rendition of "The Day the Sun Rises."

KBS "Immortal Song" special of Song Dae Kwan episode on Saturday featured f(x)'s Luna covering the legendary singers' "The Day the Sun Rises."

Luna shared that she received a letter from a deaf viewer who wrote to her, "Even though I can't hear I can feel the stage through your expressions." She also revealed that she prepared a special performance for the viewers.

Luna began the performance in front of a piano then moved to the center of the stage and began to translate the lyrics that she was singing into sign language moving the hearts of the audience with her thoughtful gift.