Sergio Silva (R) and a staff member check face masks to be donated to a hospital in his hometown, at the headquarters of Kwai in Beijing, capital of China, April 24, 2020. Sergio Silva, 42, is a veteran martial arts teacher, a professional designer, and a fledgling film director, and now he describes himself as a fighter against the novel coronavirus pandemic. Silva made and posted a series of videos on social media platforms, cheering for people in the virus-hit Chinese city of Wuhan, recounting his firsthand experience of home quarantine in Beijing, as well as introducing China's effective measures in epidemic prevention and control. He also cooperated with Kwai, a major short video platform under the Chinese internet giant Kuaishou, and launched a donation campaign to raise anti-virus supplies for a hospital and poverty-stricken communities in his hometown. (Xinhua/Li Jing)

Sergio Silva (L) demonstrates Brazilian jiujitsu actions for a teaching video in Beijing, capital of China, April 24, 2020. Sergio Silva, 42, is a veteran martial arts teacher, a professional designer, and a fledgling film director, and now he describes himself as a fighter against the novel coronavirus pandemic. Silva made and posted a series of videos on social media platforms, cheering for people in the virus-hit Chinese city of Wuhan, recounting his firsthand experience of home quarantine in Beijing, as well as introducing China's effective measures in epidemic prevention and control. He also cooperated with Kwai, a major short video platform under the Chinese internet giant Kuaishou, and launched a donation campaign to raise anti-virus supplies for a hospital and poverty-stricken communities in his hometown. (Xinhua/Li Jing)

Sergio Silva (L) inquires a staff member about the technical information of social media platform operation at the headquarters of Kwai in Beijing, capital of China, April 24, 2020. Sergio Silva, 42, is a veteran martial arts teacher, a professional designer, and a fledgling film director, and now he describes himself as a fighter against the novel coronavirus pandemic. Silva made and posted a series of videos on social media platforms, cheering for people in the virus-hit Chinese city of Wuhan, recounting his firsthand experience of home quarantine in Beijing, as well as introducing China's effective measures in epidemic prevention and control. He also cooperated with Kwai, a major short video platform under the Chinese internet giant Kuaishou, and launched a donation campaign to raise anti-virus supplies for a hospital and poverty-stricken communities in his hometown. (Xinhua/Li Jing)

Sergio Silva poses for a photo with boxes of face masks to be donated to a hospital in his hometown, at the headquarters of Kwai in Beijing, capital of China, April 24, 2020. Sergio Silva, 42, is a veteran martial arts teacher, a professional designer, and a fledgling film director, and now he describes himself as a fighter against the novel coronavirus pandemic. Silva made and posted a series of videos on social media platforms, cheering for people in the virus-hit Chinese city of Wuhan, recounting his firsthand experience of home quarantine in Beijing, as well as introducing China's effective measures in epidemic prevention and control. He also cooperated with Kwai, a major short video platform under the Chinese internet giant Kuaishou, and launched a donation campaign to raise anti-virus supplies for a hospital and poverty-stricken communities in his hometown. (Xinhua/Li Jing)

Sergio Silva (R) and a staff member seal a box of face masks to be donated to a hospital in his hometown, at the headquarters of Kwai in Beijing, capital of China, April 24, 2020. Sergio Silva, 42, is a veteran martial arts teacher, a professional designer, and a fledgling film director, and now he describes himself as a fighter against the novel coronavirus pandemic. Silva made and posted a series of videos on social media platforms, cheering for people in the virus-hit Chinese city of Wuhan, recounting his firsthand experience of home quarantine in Beijing, as well as introducing China's effective measures in epidemic prevention and control. He also cooperated with Kwai, a major short video platform under the Chinese internet giant Kuaishou, and launched a donation campaign to raise anti-virus supplies for a hospital and poverty-stricken communities in his hometown. (Xinhua/Li Jing)

Sergio Silva records a video and introduces a donation campaign he launched to Brazilian audience at the headquarters of Kwai in Beijing, capital of China, April 24, 2020. Sergio Silva, 42, is a veteran martial arts teacher, a professional designer, and a fledgling film director, and now he describes himself as a fighter against the novel coronavirus pandemic. Silva made and posted a series of videos on social media platforms, cheering for people in the virus-hit Chinese city of Wuhan, recounting his firsthand experience of home quarantine in Beijing, as well as introducing China's effective measures in epidemic prevention and control. He also cooperated with Kwai, a major short video platform under the Chinese internet giant Kuaishou, and launched a donation campaign to raise anti-virus supplies for a hospital and poverty-stricken communities in his hometown. (Xinhua/Li Jing)

Sergio Silva checks face masks to be donated to a hospital in his hometown at the headquarters of Kwai in Beijing, capital of China, April 24, 2020. Sergio Silva, 42, is a veteran martial arts teacher, a professional designer, and a fledgling film director, and now he describes himself as a fighter against the novel coronavirus pandemic. Silva made and posted a series of videos on social media platforms, cheering for people in the virus-hit Chinese city of Wuhan, recounting his firsthand experience of home quarantine in Beijing, as well as introducing China's effective measures in epidemic prevention and control. He also cooperated with Kwai, a major short video platform under the Chinese internet giant Kuaishou, and launched a donation campaign to raise anti-virus supplies for a hospital and poverty-stricken communities in his hometown. (Xinhua/Li Jing)