On selling party paid share, who owes remaining amount - original shareholder or new buyer?

As an existing shareholder of a company, I own the rights issue share of the company.

The share is party paid. If I sell it at a premium now, who will have to pay the remaining amount of the share?

Is it me or the share buyer?

New buyer

When you sell the Partly Paid share, obligation for further payments is passed on to the buyer.