Dong Gook and Jae Si, Sung Hoon and Sa Rang, Min Soo and Hoo, and Jong Hyuk and Joon Soo, the four pairs of fathers and sons and daughters from "Dad! Where Are We Going?" and “The Return of Superman,” reunite after some years and go on a trip to Hawaii together. The kids will be in charge of planning what to do. What kind of unforgettable memories will they make?