Totally Confused about 144hour free transit exemption, Do I Need A Visa??

As per other questions, We are flying from Brisbane to Hong Kong and then in Transit for an hour before our flight to Shanghai on the 22nd August and departing by Ship on the 24th August. First stop on cruise is Busan South Korea on 26th August, the cruise takes us back to Hong Kong on 29th August , then on from there never entering mainland china. Are we eligible for the 144 hour free transit.