Ha-na's grandmother said that years ago when she mention Ha-na's parents, HN screamed for an hour (hours?) so she never mentioned them again 'til now. HN didn't respond IIRC.
Later the phone rang and rang, and one of the annoying young women answered it, then the older one took it and flirted. It was the tall doctor(?) from Korea, calling to tell Ha-Na that he had found her mother, and she said she didn't know that person, and hung up. I think she'd been in an accident, maybe in a coma??, and now won't speak or eat. She's in a hospital. I guess the young motor-scooter guy, hired by the tall guy, found her. I think her husband is dead.
Something good is coming from HaNa damaging her hand. She's getting her mother back, building a connection because HaNa needs so much help with daily life, and her mother is noticing and taking care of her. Grandma is happy to see it happening.