OK SO—who killed Dr.Oh? i don't mind with spoilers

(Spoiler)
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The government did. Major Kwak right now does not know what happened to Dr.Oh. The first master will reveal to him later that he ordered the death of Dr.Oh for rebelling.

(okay hold up I think my message got deleted)
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It was the government. Later the first master revealed to Major Kwak that he ordered Dr.Oh to be killed for rebelling.

NVMMM