The Law of Lines follows the parallel stories of two young women whose lives are upended by sudden loss. When Se-oh, a recluse still living with her father, returns from an errand to find their house in flames, wrecked by a gas explosion, she is forced back into the world she had tried to escape. The detective investigating the incident tells her that her father caused the explosion to kill himself because of overwhelming debt she knew nothing about, but Se-oh suspects foul play by an …