The cast of 'Guardian, The Lonely And Great God,' Gong Yoo, Kim Go Eun, Lee Dong Wook, and Yoo In Na, go on a trip for the celebration of their drama’s 10th anniversary. From the beginning of the trip, they start bickering with each other mischievously. However, when they visit the famous filming location of the drama, they are moved, feeling as if they have travelled back 10 years. Revelling in their sentimentality, they pose by the sea, taking pictures, rousing their memories.