The end of Overwatch’s latest trailer for Season 4: Heroes of Busan shows the city flipping their billboards to show Le Sserafim’s logo. Blizzard’s event happens to fall in the middle of the girl group’s Pureflow Tour, on September 13. Blizzcon is always held at the Anaheim Convention Center, so it’s clear that Blizzard and Source Music planned all of this far in advance. We don’t know what songs will be part of this collaboration with Blizzard, but Le Sserafim’s last single is a collab itself. We would not put it beyond Blizzard and HYBE to add their sister girl groups into Overwatch as well.