
Special voice appearance by Shin Ae-ra through phone. The cast head to Hanoi, Vietnam for filming. (Current coach of the Vietnam national football team) Special narration appearance by Bae Sung-jae. The broadcast time for this episode was shifted to 16:50 (KST) instead of the usual 18:20 due to the broadcasting of the 2018 Winter Olympics closing ceremony. No broadcast on February 18 due to the live coverage of the 2018 Winter Olympics Phone Call Hint Fairy: Taeyang ( Big Bang). Special voice appearance by Twice through phone. On June 28, 2021, it was confirmed that Yoo Su-bin has joined the show's fixed cast, and his first appearance on the show will be on July 11. On June 10, 2021, it was announced that Shin Sung-rok and Cha Eun-woo would be leaving the show, and their final appearances on the show were on episode 177. Their first episode as fixed cast members aired on May 3. On April 21, 2020, it was confirmed that Kim Dong-hyun and Cha Eun-woo would join the show's fixed cast. They have officially left after episode 111. On February 18, 2020, it was announced that Lee Sang-yoon and Yook Sung-jae would be leaving the show after the completion of recording held on the same day. This marked Shin's first fixed variety show of his career. On December 29, 2019, it was announced that Shin Sung-rok would join the show as part of the fixed cast, beginning from the episode aired January 12, 2020. There are also 1-day Masters in the show, which the cast would instead spend a day together with.
The cast members spend two days and one night together with reputable figures of various fields or professions, known as Masters ( 사부), and get to know about the lives of the Masters, in the hopes of gaining knowledge and wisdom.