This is the 14557th most frequent Korean word.
물탱크뿐이었다
"It was just a water tank."
In this sentence, '물탱크뿐이었다' highlights the exclusivity of the water tank being the only object in the corner.
구석에 있는 것은 물탱크뿐이었다.
The only thing in the corner was a water tank.
Here, '물탱크뿐이었다' emphasizes that the water tank, recently introduced, was solely present during rainfall.
비가 올 때 방금 설치한 물탱크뿐이었다.
When it rained, only the newly installed water tank was present.
This usage of '물탱크뿐이었다' points out that the water tank was the sole notable item in the context of the old house.