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청계산 등산3

청계산 등산2

청계산 등산1

2023 스승의 날

Happy Teacher's day

With Sourav's parents

Happy Birthday

교수님 생신_2023

교수님 생신_2023

제130회 대한화학회_AhnLab

2022_Teacher's day
2022_Teacher's day

2021_KCS

Retirement Ceremony

Retirement Ceremony

Retirement Ceremony

Retirement Ceremony

Retirement Ceremony

POSTECH Chemistry department
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