성심껏 + 돕다 / 답변하다 / 모시다
wholeheartedly, sincerely, with all one's heart
Example
고객님의 질문에 성심껏 답변해 드리겠습니다.
We will sincerely do our best to answer your questions.
Word parts
성 sincere+심 heart
Literally 'to the full of a sincere heart'.
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성심껏 + 돕다 / 답변하다 / 모시다
wholeheartedly, sincerely, with all one's heart
Example
고객님의 질문에 성심껏 답변해 드리겠습니다.
We will sincerely do our best to answer your questions.
Word parts
Literally 'to the full of a sincere heart'.