As the birthday song plays, a baby girl is born inside a women's prison, welcomed by four inmates, each burdened by a painful past. When a rebellious newcomer arrives, clashes give way to friendship. After the baby is diagnosed with an eye disease, the inmates form a prison choir to gift the baby girl a final memory. Drawing from real-life stories, director Gavin Lin's heartfelt drama blends humour, music, and redemption.