Stepping out of her role as assistant director in Deeper Than the Sea (2016), Nanako Hirose inherits the consistent theme of family loss from her mentor Hirokazu Koreeda, and uses mature narrative techniques to dissect the thinking space of the father-son relationship. Yuya Yagira, who became the youngest Cannes Film Festival Best Actor in history with The Heart of a Child (2004), has experienced ups and downs and walked on the edge of death. He empathizes with this lonely character. After failing to commit suicide, he was taken in by a middle-aged fisherman and was given the same name as his deceased son. The delicate relationship between the father and the son is shaken by the secrets of their past. Can two "missing" lives be combined into a "circle"?