This is a jukugo word that uses the on'yomi readings of the kanji, but it uses the slightly less common けん reading for 間. Here's a mnemonic to help you remember:
You stare at the beautiful brow on your Ken (けん) doll, completely mesmerized. You wish your brow looked as perfectly groomed as his... le sigh~
The company president said, "Who wrote these documents?" while furrowing his brow.
You know, my pug's most attractive feature is the lines on his brow after all.
Please fill in your brow with black marker.