On the margins of Tokyo, a dysfunctional band of outsiders are united by fierce loyalty, a penchant for petty theft and playful grifting. When the young son is arrested, secrets are exposed that upend their tenuous, below-the-radar existence and test their quietly radical belief that it is love not blood that defines a family.

Sang-hyeon is always struggling from debt, and Dong-soo works at a baby box facility. On a rainy night, they steal the baby Woo-sung, who was left in the baby box, to sell him at a good price. Meanwhi...