Security quickly stepped in to stop things from getting worse. KSI left the building with a smile on his face, while Danis was angry and tried to fight back.
This isn't the first time these two have had problems. They were supposed to fight before, but it got canceled. At that press conference, Danis threw coffee at KSI.
KSI was originally set to fight Wayne Bridge, a former Chelsea player. But Bridge backed out after KSI made some very personal comments that upset Bridge's family.
After Bridge pulled out, KSI's team looked at other options. They talked to UFC stars Nate Diaz and Jorge Masvidal, but couldn't make a deal work.
Now, KSI and Danis will finally settle their differences in the ring. Their fight will be the main event of the 'Unfinished Business' card put on by Misfits Boxing.
Former UFC fighter Darren Till will also make his return to the ring on the same night. With all the bad blood between KSI and Danis, fans can expect an intense fight when they finally meet in the ring.