Jungwan & Fabian are working as problem solvers for the youngest member of the rainbow, Kwak Dong Yeon. It's a interesting encounter between engineering student Seokjin and liberal arts student Hyunmoo! They make up for each other's shortcomings, and they give off extraordinary chemistry. Hong Chul & Kwang Kyu are invited to Shim Hyung-tak's. They were overwhelmed by the incredible sight before them. They're going back to their childhood and having a good time.
