Bring a large pot of water to boil and add sweet corn. Boil for 4 minutes then transfer sweet corn to a colander and rinse well with cold water to cool down and stop the cooking process. When cool enough to handle, use a sharp knife to cut the corn kernels from the cob. Transfer corn to a large mixing bowl. Add mango, beans, tomato, red onion, jalapeno, and cilantro and mix till well combined. Squeeze the juice from one lime over the top and toss to distribute. Season to taste with sea salt and fresh ground pepper.