Whenever you make a mistake-big or small-saying sorry is always the right move. 

Like spilling a cup of coffee on important documents during a meeting. 

Or stepping on someone's foot by accident. 

This expression helps you acknowledge the mistake politely and keep things smooth.  

English: I'm sorry./ Excuse me. 

Korean: 죄송합니다. 

Korean Romanization: Joe-song-ham-ni-da