Recently ended tvN drama 'Reply 1997' brought back the 90's to Korea and while the viewers are still reveling in the after-effect, Seo In Guk (who played Yoon Yoon Jae) and Lee Shi Un (who played Bang Sung Jae) will be guests on tvn's 100% live variety show, 'Three Fools'.

In a press release, the production announced, "Seo In Guk and Lee Shi Un will be parodying 'Reply 1997' in a segment on the show. Since 'Reply 1997' revived 90's hit songs, we plan to piggyback off of that and we will hold an exciting music quiz between the two guests and the 'three fools'. This summer, Seo In Guk won the hearts of women with his 'Yoon Jae' role and he will be showing his unscripted, honest self on the show. Lee Shi Un can make people happy just by being himself. The combination of the two will make for a fun Sunday night."

tvN 'Three Fools' is a new type of variety show where it is filmed 100% live with no editing or second takes. The MCs are Lee Soo Keun, Eun Ji Won, and Kim Jong Min, who are the 'three fools'. Since it is a live broadcast, the MCs get to interact with their viewers and send prizes to the participants. 'Three Fools' airs every week on Sunday at 9 pm.