Xie Xu, 18, and Zhang Chi, 19, are students at Daxu High School in northern China's Xuzhou. They're best friends and, like many friends, they commute together when heading to school.
With one small difference: Xu carries Chi on his back to school - Every day.
Chi has muscular dystrophy and is unable to walk on his own. Clearly, the school and the route to get there are not particularly handicap-accessible.
Chi has never missed a single day of class, thanks to his best friend Xu.
Xu has been helping his friend like this for three years. The boys are not related, but it's clear they share an incredible bond of friendship.