Why was Moon Jae-In briefly imprisoned as a university student?

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Moon Jae-In was briefly imprisoned and expelled from Kyung Hee University due to his involvement in the student movement against the authoritarian regime of President Park Chung-Hee.1

During his time as a student in the 1970s, Moon participated in activism aimed at challenging the government's restrictive policies and the Yushin order, which had significantly expanded presidential powers and curtailed civil liberties. Following his expulsion and imprisonment, he was conscripted into the South Korean army in 1975.123