What should I do if I want to break the lease as soon as we move in?
Why do you want to break the lease after moving in ?
I don't like this place.
You should avoid breaking your lease unless it's absolutely necessary. You will most likely be expected to cover the rest of the payments. It will also negatively impact your reputation as a tenant.
I will do it anyway and pretend like I wasn't aware of it.
A lease is a contract that you willingly signed. Even you pretend to be unaware of that, you will still be held liable for the lease in court. This is why tenants should not break a lease.