SEE ALSO: Kang Ho Dong appointed as a director at SM C&C

MC GREE and Song So Hee will be guests of the show on this week's episode in celebration of Children's Day (May 5).�Once he entered the classroom, MC GREE began playfully attacking Seo Jang Hoon by saying that he talks too much. MC GREE, son of entertainer�Kim Gu Ra, is known to be close to his dad's acquaintances, including Seo Jang Hoon.�

To MC GREE's comment, Seo Jang Hoon responded by retorting, "[Your father] Kim Gu Ra is the one who is the most talkative in this world!" Kang Ho Dong, who was listening on the side, asked MC GREE, "Does Seo Jang Hoon talk a lot when he is on the phone with you?"�MC GREE simply responded, "Uncle Jang Hoon is basically a TMT -- Too Much Talker."�

Make sure to tune into 'Knowing Brothers' for more on May 5 at 9:00 PM KST on JTBC!