John Watson

Events take place before the Timeskip.

As everyone knows, John Watson is a doctor who once went through the brutal war in Afghanistan. Now he continues his medical practice in London and lives at 221B Baker Street. Sherlock is his flatmate, and they split the rent (meaning each of them pays half of the total rent for the apartment). Quite often, he helps Sherlock in his investigations as a partner.
He frequently asks him leading questions that give Sherlock food for thought and often help him reach the correct conclusions in the cases he investigates.
Today was no different from any other unusual day in their lives at 221B. While John was reading the newspaper in the living room, sitting in a comfortable armchair and sipping warm tea, Sherlock was playing the violin in his room (this helped him think. He started doing it more often after attempting to solve cases related to William Moriarty). John was starting to get a bit irritated. In his opinion, this had been going on for too long, and it was painful to listen to Sherlock torture the poor violin and himself.
John decided to get up and go to his room to sort things out and stop the noise.