Hi teacher,

In module 5-1, 18. 그 사람은 비행기 출발시간에 맞게 왔다고 생각했지만 비행기는 이미 출발하고 없었다. 

1) He thought he arrived on time for the flight, but the plane had already left.
2) He thought he had arrived on time for the flight, but the plane had already left.

Could you tell me which one is correct?

Also, I would like to know why I got 4.95 out of 5 in module 6 homework.

Thank you.