Can anyone tell me? Why the fuck that old hag stabbed Lee Nok? Did Lee Nok do something to...

Read the first few chapters: It's the old man that made a deal with Jaeshin to have immortality or live longer. But Jaeshin monkey-pawed him and had the old man's lifespan and his son's switched. So his son died while he still lives. The old man paid his greed with his son's life while Jaeshin's 'greed' was paid with Nok's.

Thank you so much