This is the 6910th most frequent Korean word.
자신은
"자신은" means "oneself" or "self" in English.
In this sentence, '자신은' refers to oneself, emphasizing personal responsibility.
자신은 항상 노력해야 합니다.
One must always strive to do their best.
Here, '자신은' is used to indicate the subject clearly as 'he or she.'
자신은 그것을 몰랐습니다.
He/she was unaware of that.
In this usage, '자신은' points out the individual experiencing the feeling.