Like Qingliu, there are many social service organizations across the country contributing to the battle against COVID-19 through their volunteering services in communities and online.

China's social services sector has grown in recent years, with some 737,000 licensed social workers, as of last year. The number was about 288,000 in 2016, according to the Ministry of Civil Affairs.

"Social workers should act like a bridge linking residents and local governments, but in China, many people are not familiar with the profession, and the sector's development is in the early stages," Sun says.

She says she did not know what social work was before entering college.

In China, social work education began in the 1980s. In 1988, the then State Education Commission approved the launch of social work and management major in four universities, including Peking University and Renmin University of China in Beijing. Now, more than 300 universities and colleges offer bachelor's degree programs in social work major and more than 100 offer master's programs in the same major.

Social work is the practice-based profession and an academic discipline that promotes social change and development, social cohesion and the empowerment of people, according to the International Federation of Social Workers.

In China, social work covers such sectors as social welfare, social assistance, poverty elimination, marriage and family affairs, mental health, disabled people's rehabilitation and employment assistance.

After Sun graduated from Suzhou University of Science and Technology in 2011, she went to Shenzhen in Guangdong province to promote social work in 2011.

After a year of practice, she returned to Suzhou and became the first full-time social worker at Qingliu, a private agency.

"At first, it was quite difficult, because I had no program and no team. There was even a summer month that I could hardly make ends meet," Sun says.

Sun, who specialized in social services for children and families, has helped many who were struggling with social or psychological issues.

Among the cases was one that happened about 10 years ago, when an 8-year-old girl was sexually assaulted by a neighbor. The parents reported to the police and under the parents' approval, Sun was contacted to help the family get through the trauma. Suffering from PTSD, or post-traumatic stress disorder, the girl and her parents urgently needed timely help and treatment. Within 10 months, Sun had met the family multiple times.

"At first, the girl could not sleep at night and didn't dare to go to public areas, and after our 48 visits, she was back to her normal life," Sun recounts.

For the past 10 years, Sun has kept contact with the family to keep an eye on the daughter, in case some related symptoms come back as she grows up.

Sun says there are about 100 child sex abuse cases every year on average in Suzhou, and most of the victims and their families need help from social workers.

Besides helping individuals in need, Sun has also cooperated with local authorities to organize and develop social programs to improve the quality of life in communities. With many successful cases and community programs, Qingliu has been growing－from only one full-time worker, Sun, in 2012, to about 30 full-time employees today.

"I am the lucky one to let social work be seen by more people," Sun says.