| Almost everyone has a question regarding life and the goal of life. In order to find the answer, the four young men with full of curiosity regarding their lives, Lee Seung Gi, Lee Sang Yun, Yuk Seong Jae, and Yang Se Hyeong, head to find their master to learn things and get a correct answer. They find the master and spend a day in the master’s place to learn things that they didn’t know, and wish to know. Whom will they get to meet? And what will they learn throughout the stay? |
| Name | Character | Episodes |
|---|---|---|
| Cha Eun-woo | (Episodes 116-177) | 238 |
| Kim Dong-hyun | (Episodes 114-present) | 238 |
| Kim Dong-hyun | 16 | |
| Cha In-pyo | Himself | 3 |
| Lee Soon-jae | Himself | 2 |
| Youn Yuh-jung | Herself | 2 |
| Kim Soo-mi | Herself | 2 |
| Kwon BoA | Herself | 2 |
| Park Jin-young | Himself | 2 |
| Lee Duck-hwa | Himself | 2 |
| Choi Min-soo | Himself | 2 |
| Jung Doo-hong | Himself | 2 |
| Ki Hong Lee | Himself | 1 |
| Chang Ki-ha | Himself | 1 |