Naeseong River, a natural sandy river, is being destroyed in the wake of the construction of Yeongju Dam, as part of the Four Major Rivers Restoration Project. Buddhist monk Jiyul, who denounced those who destroy nature and called for the preservation of life through his documentaries, including Following Sand River (2012), and Naeseong River, a Letter on the Water (2014), focuses on the swallows that make Naeseong River their home. Swallows from Southeast Asia return to the Korean Peninsula in the spring, and a considerable number of them congregate around Naeseong River. This could mean that this place is worth living in, compared to other places where the ecological environment has deteriorated. However, with the construction of Yeongju Dam, some areas have been submerged, causing the disappearance of the swallows’ nesting sites, but the government shows no interest. Having observed the environment of Naeseong River since the announcement of the Four Major Rivers Restoration Project, Jiyul incorporates the ecology of swallows here, the difficult reality, and the swallow protection movement of the residents in this short documentary. (MOON Seok)