Hee Joon and Jam Jam go to a kids' electric car club meeting. At the meeting, Jam Jam drives around in various cars and meets new friends there. Ra Ra sisters are waiting for their guests to arrive at their place. Ra Won is especially nervous and shy as the guests are very handsome. Now, William and Bentley are old enough to play with each other without their dad. As Sam is about to relax, he discovers a strange number written all over his house that scares him.