I

Explanation

1. I
A form of '저' (I), the humble form used by the speaker to show humility, when the postpositional particle '가' is attached to it.

2. he; she
A form of '저' (he/she), a word used to indicate a person who is being talked about, when the postpositional particle '가' is attached to it.

Examples
제가 알기로는 그렇습니다
그 일은 제가 한 것이 아닙니다
교수님, 이 일은 제가 맡겠습니다

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