"World is One 2021" is the collaboration digital single by LOONA's Chuu and WEi's Kim Yo Han and featured Eric Bellinger. It was released on September 15, 2021 as part of the "2021 World is One Global Movement" by MBC and World Vision to create a better world for children who are marginalized by the ongoing COVID-19 pandemic. The campaign involved a dance challenge and concluded with an online concert that was held on October 30, 2021.[1][2]
