Kim Ryong-hee, who lost her child during her escape from North Korea, survives day by day with a heavy burden of guilt. One day, Kim Yeon-hee, a seventeen-year-old girl, appears at the convenience store where Ryong-hee works and steals an expired onigiri. Ryong-hee is shocked to learn that Yeon-hee, a runaway girl, is pregnant with a child whose father, she says, will only be known "after giving birth." Through Yeon-hee, who is like a small bird that has flown into her life, Ryong-hee finds hope to break free from the guilt she has long carried and start a new life...