Just a data point:

A friend and I flew to ICN, S Korea for business from HKG. We used our Canadian passport to enter.

We were sent to secondary with a full check of all our bags, we ask as this was a first for use travelling to S Korea on business using Canadian passport over 20 years. They reply from the supervisor was that they have been given a directive to check all inbound Canadians. I am pretty close to retirement but my friend was in his 30s and looked much younger.