This is the 5808th most frequent Korean word.
부담이다
To be a burden or pressure.
In this sentence, '부담이다' expresses a sense of worry or stress that a person might feel when considering taking on a specific responsibility or duty.
그 일을 맡는 것이 부담이다.
Taking on that task is burdensome.
Here, '부담이었다' is used to denote feeling uneasy or overwhelmed by the situation, in this case, receiving a gift that feels too substantial.
너무 큰 선물을 받아서 부담이었다.
Receiving such a big gift made me feel uneasy.
In this context, '부담이 되었다' reflects the guilt or discomfort felt due to the realization of having asked too much of someone.