Awarded to the player of the series, Gagai became the first winger to win the award, breaking down in tears on stage as he accepted the honour.
It was well deserved, with Gagai clearly the best from either side for the series after running for a series-high 577 metres and scoring two tries across the three games.
Speaking to NRL.com in the dressing sheds after the match, Gagai said the award would be something he would always treasure.
"I'm feeling a bit overwhelmed. I haven’t really won anything like this before, especially at this level of football," Gagai said.