This is the 11782nd most frequent Korean word.
내면에
"내면에" means "inside" or "within (oneself)."
내면에 is used to refer to the inner self or the emotions and states within an individual.
그녀는 내면에 깊은 슬픔을 감추고 있다.
She hides deep sorrow within herself.
Here, 내면에 describes the metaphorical inner self where truths or emotions are harbored.
내면에 있는 진실을 마주하려면 용기가 필요하다.
Facing the truth within requires courage.
내면에 in this sentence points to the inner state or self of a person where abstract qualities like tranquility reside.