Ngl I think it's pretty irresponsible for the grandpa to refuse surgery so this time, knowing he didn't have long to live but not writting up a will to have his dearest sin and grand daughter inherit everything. If he thought surgery wasn't his prolong his life more he really should have prepared more diligently in tying up sent loose ends
I'm su scared that sangmin is gonna go crazy and hurt yeonhee. But in another note it's weird how he was hated by his older brother and outcasted by the family when it seems him and hyemi had the same mother, like what happened?