180 180 Reception of Warm Words

Hand in hand, October and Lexus came into the greenhouse where the reception was held. As soon as they stepped inside, claps of congratulations instantly errupted from the guests that were already seated on their chairs waiting for the newly wedded couple. 

The couple was followed by the solemn-looking Grandpa He who seemed like he was about to go to war because of the bloodlust in his eyes. Of course, the rest of the couple's peers was also not looking good. 

The guests' felt their smiles to freeze as cold sweat as the heavy and intense atmosphere hovered over them. Who do they feel like they were in a snowy mountain peak rather than in a greenhouse with the sun in the sky? 

What could have happened in that short amount of time at the garden?