A lively, cheerful, youthful and outspoken handsome guy; a beautiful, outgoing and refreshing little girl; two people who would quarrel non-stop when they met, turned out to be roommates. Gradually, they found that they had fallen in love with each other unknowingly, and their relationship changed and they gradually became alienated. A year later, they graduated and went their separate ways. Two years later, the boy returned from studying in Switzerland. They met in a very strange environment. After that, an earth-shattering love battle began. ． ． ． ． ．