A Korean girl working as a waitress in a Korean pancake restaurant in Tokyo said,
she saw Onew, Taemin and Jonghyun, came with 2 Japaneses, not long ago.
Onew was so pleased that she spoke Korean, and asked which food was the most delicious one there. She recommended several food and they ordered all she recommended.
She said Onew was super kind and polite that while the Japanese people who came with them were paying the bill and other members were outside, Onew cleaned up the table piling up all the dishes so that the waitress could work eaiser.
He bowed and said Bye in Japanese as he left there.
(Yes, my boy~! ^^)
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Source - dub.dothome.co.kr