The film depicts the deaths of numerous Koreans forcibly displaced to Sakhalin during the Japanese colonial period. It begins with the sound of waves, transitioning to images of the rolling sea. The sea is not merely nature, but a space of diaspora, where countless spirits who could not return from Sakhalin and were massacred and drowned in Tsushima reside. It is a space where their return was thwarted by colonial power, leading to their drowning.