"Let's go~♪ Jeju Island~!" This time, we're not alone, we're together! Rainbow members travel to Jeju Island to celebrate the 4th anniversary of the founding of the rainbow group! There's a treasure hunt in a green tea field, does yoga while watching the sunrise and drink Jeju water. It's a bucket list trip full of the rainbow members personality. During night there's a red carpet, fashion show and awards ceremony. There's also surprise appearances so look forward to the 4th anniversary celebration!