So the problem is -- I moved .ai file into sub-composition and then zoomed this composition inside of the main composition. And now it's blurry.
I know for the vector files I can choose "Continuously Rasterize", but in my case it's not just a vector layer, it's vector layer inside of the composition.
There is a option called "Collapse Transformations", it helps and makes vector layer nice and smooth, but it ruins the puppet-animation that is inside of the comp.
What should I do?