It seems You must sacrifice one of the island inhabitants. There is a bug in the network proving impossible to exterminate. The bug will make it so that both Charlie Pace and Jin Kwon will have all their memories of the island in tact. The Dharma Institute computations also show that this will result in absolute failure if the wrong islander is selected. One of the two will be driven to depravity, the other will lead to certain victory choose wisely: