When deliverymen bring cardboard boxes to his doorstep, Zhang Shuai transforms them into interactive toys for his 5-year-old daughter Nini.

The 32-year-old father from Zhengzhou, Henan province, has made more than 120 toys from waste cardboards in the past three years.

His toy-making videos have gone viral and many netizens have commented that they show an environmental-friendly way to spend quality time with children, especially during the COVID-19 quarantine. His Douyin account has garnered nearly 3.4 million followers.