Am I eligible on a CANADA-BEIJING-HONG KONG-SEOUL-BEIJING-CANADA itinerary?

We are flying into Beijing from Canada and plan to apply for the 144hr Visa. We then fly Beijing->Hong Kong. A week later, we are flying from South Korea->Beijing->Canada when the layover in Beijing is 6hr, where we do not leave the airport. Is this eligible for 144hr Visa based on the Visa rules?

CANADA -> Beijing (144hr Visa) -> HONG KONG
SOUTH KOREA -> Beijing (24hr airport-only) -> CANADA

Thank you!