Already in the sixth minute, the 28-year-old goal king got to introduce himself to the Sundsvall audience.
Häcken was awarded a penalty after a hand situation, Jeremejeff stepped forward and rolled coolly into the opening goal.
A very similar situation arose six minutes later, but in the second penalty area.
Gif Sundsvall then got a penalty after the ball took the Häcken defender's hand.
Then it was Pontus Engblom, the 30-year-old captain, who certainly managed the penalty to 1-1.
The position stood until the halftime break.
Once it was over, it was a Häcken, determined not to lose points against 14th placed Sundsvall, who stepped out.
Even Hovland ensured Häcken regained the lead in the 58th minute through a header from a corner.
Then it was Jeremejeff's turn again.
As a goal scorer often does, he appeared in the right place at the right time and poked in 3-1 for Häcken.
It was his 14th goal in 13 Allsvenskan matches.
Even though the win felt secured, Häcken was not ready.
Substitute Oscar Uddenäs put 4-1.
Then the 19-year-old played before he played until Lars Olden Larsen who made it 5-1, just a minute after Olden Larsen came on the field.
The win takes Häcken back to first place in the Allsvenskan, one point ahead of Djurgården despite a match less played for Hisingelaget.