Luka waved goodbye to his students, that were leaving his classroom for the day. His exhausted smile wavered after the last boy exited the music room and he sat down on his desk.

Finishing his preparations for his next classes, he leaned back in his seat and closed his eyes. Only his colleagues should be in the building by now and he was thinking of inviting them out with him.

His train of thoughts was interrupted when someone opened the door.