The exposure they get performing on the streets has also created alternative income streams from commercial gigs and song-writing commissions. The money they earn from all these sources, in addition to Liu's salary as a full-time analyst, has allowed the couple to lead "a life that is comfortable but far from being well-off".

"While we envy the salaries of our friends, they are also jealous of the fact that we're doing what we really enjoy," Liu said, referring to how most of her former classmates are currently in well-paying jobs.

"You don't choose to become a street artist because you want to make lots of money. You choose it because this is what you love."

Shanghai is well-known for its biting cold in winter and extreme humidity and heat in the summer, and performing in such conditions has always been a challenge. Liu said she would seek reprieve from the cold in a nearby convenience store so that her hands could stay warm enough for her to perform.

In summer, the couple is usually standing in a puddle of their own perspiration. The rainy season also poses worries because an unexpected downpour could damage their sound system which they have spent much of their income on.

But the couple said they have little to complain, as being able to lead a life as street artists has always been what they desire and the very reason they moved to Shanghai.

Most cities in China prohibit people from carrying out commercial activities in public places. However, in 2014, Shanghai became the first city on the mainland to regulate street performances by issuing eight licenses to artists. The license is issued by the Shanghai Performance Trade Association, which is in charge of the regulations regarding the management of local street artists.

Authorities in Guangdong province's Shenzhen followed suit in 2015. This year, Chengdu, the capital city of Sichuan province, did the same.