Marius De Zager.

Lou had been in love with Marius for a long time, and a girl named Mary was also in love with him. She was one of their group.

Lou had been in love with Marius for a long time, but when he found out someone else was in love with him, he was furious. Only his best friend, Saar, knew about Lou's crush, and she always sided with him.
Mary and Lou were always fighting. Mary's hair was always flying because Lou was always grabbing her hair during fights. Mary always punched Lou in the nose, which always made it bleed. Because of this, their friends called them "rivals," but they didn't know who they were fighting for.

Lou Goossens – blue-eyed, fair-haired, short, handsome, and sweet. 15 years old. He was in love with Marius and fought with Mary over him. His relationship was described exactly like in the Alena Shvets song "Rival."
Marius De Zager—brown-eyed, dark-haired, tall, strong, and handsome. 16 years old. He didn't know why Lou and Mary were always fighting, not suspecting it was because of him.
Mary Miller - Redhead, green eyes, short. She was in love with Marius, knowing that Lou liked Marius. 15 years old.

It was evening. The group was strolling through the park where some kind of celebration was taking place. Everyone was there except Lou, Saar, and Mary; they were fighting somewhere again.
Marius: So, where are those two again, and... where is Saar? Did she run off with them or something?