f(x) Luna cleaning the practice room for her musical herself was revealed.

The producer for the musical "High School Musical" Kim Kyu Jong posted on his Twitter yesterday, "f(x)'s Luna who comes one hour before run-through to clean the practice room!! A rag in one hand and the piano recording in her phone in the other" along with a picture.

In the picture, Luna is mopping the floors of the musical practice room. With 'High School Musical' opening on July 2, Luna is listening to the recording and is practicing hard.

Internet users who saw this commented, "Even though it's blurry, you can tell by the energetic mopping that it's Luna," "Fighting!," "It's so good to see that she tries her best in everything," and "Can't wait for the musical."

Luna will be playing the role of Gabriela in the musical "High School Musical" opening on July 2.

Photo Credit: Twitter