Tyler "Ninja" Blevins, the world's most popular "Fortnite" player, was in attendance; he helped launch the Galaxy S9 last year too.
The winners of Level Up's "Fortnite" tournament got to meet Ninja and earned Galaxy S10 phones for their efforts.
"Fortnite" has a special skin based on iKon member Jung Chanwoo; only people who buy the Galaxy S10 will be able to unlock it.
Fans packed the house for iKon's performance and a special panel discussion with Ninja and the group.
In case you're wondering what iKon's music sounds like, you can listen to one of their top tracks here.