Kang Haneul’s character is described as a popular idol with a prickly personality, and Chanyeol is considering the role of his groupmate and cousin. It’s not specified who will be on the island other than the main pair (early reports mentioned a whole host of fellow passengers, including managers and support staff, but current reports make it sound like it’ll just be the two leads), so we’ll have to wait for clarification on if we’re getting Blue Lagoon scenario or something more like Lost.