We either have to suspend our disbelief or she was smart enough to wrap it back
Lol im going to pretend that the seller was spying on her xD Coz its not like her mother wanted to spy on herself by turning it on , its not like she had death threats coz it was a gift and she didnt need it to be on in her own house she can gift it to her daughter and then can keep and eye on her from invaders or etc ..
Did they show the scenes where mina confessed her feelings in next 3 confessions before she tell gyeoul that she has only 1 left ?? Or was that assumed that she has only 1 left and got failed 4 times ...?
The fact they all died doesnt give the temptations as it used to do before coz everyone endup staying alive somehow . It reminds me the story of shepherd and the wolf .. We(viewers) are the villagers , writer the shepherd , deaths the wolf and now that the writer is screaming that they all died , we audience are like "Yeah, right !" .lol
K-Drama 
Coz its not like her mother wanted to spy on herself by turning it on , its not like she had death threats coz it was a gift and she didnt need it to be on in her own house she can gift it to her daughter and then can keep and eye on her from invaders or etc ..
Or the ost is not release yet??
It reminds me the story of shepherd and the wolf ..
We(viewers) are the villagers , writer the shepherd , deaths the wolf and now that the writer is screaming that they all died , we audience are like "Yeah, right !" .lol