When Jung-soo reaches Mi-Na, they discover her phone was damaged and cannot be used. She asks him if she can call someone. Without telling her the phone number she wants to call, he dials her mother on his own phone.
Jung-soo leaves Mi-Na a half bottle of water. Her body is trapped under the rubble and although she can move her hand, she cannot move her arm. When he returns in later days, she apologizes for having drunk the rest of the water, but there is no way she could have gotten the bottle to her mouth.