Do they hack Netflix too?

I am currently using Netflix linked through my Naver membership.
Recently, several titles I haven't watched have appeared in my viewing history.
The viewing dates were around October 7th.
Since I only use one device, it can't be family or acquaintances,
and I don't share my ID with anyone.
I live alone, so it's not like someone came over and watched something.
Could it be related to the previous personal information leak at tvN, which I had used via Naver membership?
This feels really unsettling... I've changed my password for now, though.