How to Say "What is this? (to the owner)" in Korean?

"What is this? (to the owner)" in Korean is 사장님, 이거 뭐예요? (sajangnim igeo mwoyeyo)

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• 사장님 (sajangnim) - business owner (you can call shop staff this too)
• 식당 사장님 (sikttang sajangnim) - restaurant owner
• 카페 사장님 (kape sajangnim) - cafe owner
• 어서 오세요! (eoseo oseyo) - Welcome!
• 사장님, 안녕하세요. (sajangnim annyeonghaseyo) - Hello. (to the owner)
• 사장님, 맛있어요! (sajangnim masisseoyo) - It's delicious! (to the owner)
• 사장님, 감사합니다. (sajangnim gamsahamnida) - Thank you. (to the owner)
• 이모 (imo) - auntie (what you call a woman serving food) / aunt (mom's sister)