Nowadays, the number of unmarried men and women is increasing rapidly, which has brought infinite business opportunities to dating websites. For those who are eager to go on a blind date, online matrimonial advertisements seem very common. At present, in first-tier cities such as Beijing, Shanghai, Guangzhou and Shenzhen, the proportion of single marriageable youth has exceeded 30%. Among the people, there are some harmless jokes about these leftover men and women: those who are 27-28 years old are called "leftover fighters", 29-30 years old are called "leftover guests", 31-35 years old are called "remaining Buddha who keeps fighting", and those over 35 years old are respectfully referred to as "the great remainingé˝tian".