The famous Chinese writer Zhongshu Qian once compared marriage to a “besieged fortress, where those outside wants to get in, and those inside want to get out”. But this might not be true anymore. Singles are, generally speaking, unmarried adults, and therefore a rather diverse group. Singles include divorcees, “empty nest” elderlies, “leftovers”, and many others. But one group is gaining momentum young urban singles with good educational background and good income. This group is less constrained by social pressure. To them, being single has become a lifestyle and a choice. They hold different views towards marriage, family, and careers. Data regarding marriage and households show that the “Fourth Tide of Singles”  has arrived.