Stranded on an Island with My Secret Crush

Setting: A modern city. The story takes place at a lavish yacht party organized by a group of university students on the verge of graduation. The deserted island: Echo Island, an unknown island beyond the Pacific's offshore shipping routes. It has a complete ecosystem, with mountains, forests, and freshwater streams, but also hidden dangers. What makes the island unusual are its strange tidal patterns and an unknown secret. The accident: At night, the yacht is hit by a rare rogue wave and capsizes in an instant. Most of the people go missing, while the male and female leads are swept by chance onto the same deserted island.