Hammarby had three straight games without a win in the backpack.
Norrköping, on the other hand, has a better suite behind them, four straight victories.
And at Tele2 arena on Sunday, two suites were broken.
"Incredibly nice"
Bajen took the lead after just over half an hour of play.
Then Bojanic had to set his first goal of the season - and also revenge after the penalty miss in the derby.
- It's incredibly nice, very nice.
I do not know what to say, says Bojanic in Disocvery +.
Jacob Ortmark had sharp goal chances but without getting the desired finish.
And Jonathan Levi's free kick was really dangerous but Beijing did not get a draw before the break.
Selmani shone
This Sunday was simply Bojanic's day.
The midfielder extended the lead to 2-0 in front of the home fans with 25 minutes left in the match.
The joy of Hammarby continued.
Astrit Selmani put a safe shot at distance and 3-0 was a fact.
- I think we are stable, strong and we work on the whole match.
We score three goals, let in zero, says Bojanic.
- I pay tribute to the whole team.
Hammarby now goes with three new points up in the league lead in front of AIK, with a match to spare and on the same points.