John agreed to purchase a country house from Dylan for ten million dollars. Dylan drew up a contract of sale, whose terms were reviewed by his attorney, and mailed it to John. John signed the contract and mailed it back to Dylan along with the agreed-upon down payment of six million dollars. Dylan received the contract, but never signed it. He did, however, deposit the down payment in his checking account. Despite the fact that the contract was never signed by Dylan, he allowed John to move into the house. Dylan then received a better offer for the property, told John that he would not transfer the property to him, and told him he must move out. John sues for breach of contract. Who wins and why?