This is the 536th most frequent Korean word.
마치고
"마치고" means "after finishing" or "having finished."
Here, '마치고' means 'after finishing' and connects the action of finishing the class to the following action.
수업을 마치고 집에 갔다.
After finishing the class, I went home.
Here, '마치고' is part of a phrase expressing the desire to finish something, turned into an unrealized intention due to lack of time.
마치고 싶었지만 시간이 부족했다.
I wanted to finish it, but there wasn't enough time.
In this sentence, '마치고' conveys the sequence where finishing the match transitions to doing an interview.