Two close friends who are more than 20,000 kilometers apart have not seen each other for more than half a year. On the evening of January 31, Chinese little boy Huang Yicheng and American artist Carla met for a "cloud gathering" in the ancient city of Zhangzhou, Fujian.

The two exchanged letters, and the "reverberation" of an encounter in Yunshui Yao never ceased. Knowing that Carla could not forget the croaking frogs in Zhangzhou's countryside, Huang Y Micheng also wrote back to Kara, introducing Zhangzhou.