SEE ALSO: 'Knowing Brothers' reveals teaser for next week's episode featuring Apink

In the preview, A Pink's Eunji, Bomi, Hayoung, and Namjoo invite Damyool to their dorm where they become mothers for a day. The girls are just as adorable as they do their best to get Damyool to smile and laugh by singing and dancing along to "Mr.Chu" in costumes and more.

Stay tuned for their appearance next Saturday!