My Three Protective Brothers - Episode 10

Natalia tries to open a family safe but fails, leading some family members to accuse her of being a fraud trying to deceive the Sullivan family. Matthew orders her to leave, but Natalia insists she is their real sister and suggests the safe might be broken after years of disuse. Her brothers remain skeptical but encourage her to try again, urging her not to be afraid. The episode ends with Natalia preparing to attempt opening the safe once more, as her brothers grapple with the possibility that she could be their long-lost sibling.