AC028 Air Canada Shanghai to Toronto with a stop in Seoul, is it a direct flight or a transfer?

AC028 Air Canada from Shanghai to Toronto with a stop in Seoul, is it a direct flight or a connecting flight?
AC028 Air Canada, Shanghai to Toronto is a direct flight.
Direct flight, as it is due to the pandemic prevention and control policy of the first country in the world that foreign airline crew can only handle it technically.
AC028 Air Canada, there is a direct flight from Shanghai to Toronto.
Direct flight, as it is due to the epidemic prevention policy of the world’s number one country, foreign airline crews can only deal with it technically.