The grandmother is the concubine or second wife of her paternal grandfather. Basically Mo Hauwen’s (mc father)stepmother. She usually lives with her own son the MC uncle but she came to live with the MC father because she wanted to scheme to marry her niece to mc father as his new wife. Then she later tried to scheme against mc and her father with the bribing scandal. She’s basically someone who’s not related to them at all, but because she’s the second wife she’s still counted as the grandmother and the MC and her father treat her as an elder to maintain respectability and so they aren’t scolded for being unfilial