For her new SBS drama, 'To the Beautiful You', f(x)'s Sulli will be taking on an action scene in the bathroom against�Mighty Mouth's Sangchu, who will be making a cameo appearance.

The plot follows Sulli's journey at an all male high school to meet high jump gold medalist 'Kang Taejun'. Each day brings about more and more surprises as she fights to survive as the only female student in the school, and her biggest problem yet arises when she's called to a bathroom to face off against Sangchu, who will make a special cameo as a chiseled muscle man.

The reason for the face off is because Sulli accidentally pulled down Sangchu's pants while blindly trying to grab for something to catch her fall. Angered, he calls her out for an action scene fans won't want to miss!

At the actual recording, Sulli was said to have been shy and slightly embarrassed about filming in a men's bathroom, which made everyone on set chuckle.

Source + Photos: Sports Chosun via Nate