Eun-soo, a devoted housewife, faces a daunting challenge as she struggles to cover her husband’s mounting medical bills due to his terminal illness. In her desperation, she finds herself caught up in a drug-related situation involving a mysterious teacher named Yi-kyeong. As their paths intertwine, they become the targets of seasoned detective Tae-gu, who is hot on their trail, determined to uncover the truth behind their connection.