Beijing - Hong Kong - Beijing - Helsinki

Hi!

So I understand Hong Kong -> Beijing -> Helsinki is eligible for the 144 hours visa free transit.

But I am just wondering if it works for me, because i flew from Helsinki to Beijing with a normal visa. Then later booked a flight to Hong Kong staying there for a week.
Now I have to go back via Beijing to Helsinki, will it still be eligible? Because i have read on a blog that al flights have to be on 1 itinerary...