Nuance Dictionary / Overwhelm & Struggle
부담스럽다 bu-dam-seu-reop-da
Feeling pressured or weighed down by an obligation, request, or expectation
It's the specific discomfort of someone doing 'too much' for you, or asking for 'too much' from you. If a new coworker buys you an expensive gift on day one, the gesture itself feels '부담스럽다' — you now feel obligated to match it.