Nail manicure

I went to consult because a nail shop opened in the apartment shopping mall~

I heard that nail care lasts about 3 to 4 weeks, but my nails are very brittle and breaking, so I'm wondering if I should go ahead with it.

It won't break while I'm applying the nail polish, but what will happen after I remove it... Will it break more? Or will it get better?

The director also can't give a definite answer,ㅠㅠ