This is a jukugo word that uses the on'yomi readings of the kanji. You haven't learned the on'yomi for 狼 (wolf) yet, so here's a mnemonic to help you remember that, as well as which on'yomi to use for 人:
There's a werewolf in front of you wearing jeans and eating roe (じんろう). This is typical behavior for werewolves, as I'm sure you know.
Have you ever seen a werewolf?
The truth is, the teacher of this class is a werewolf.
"Werewolf" is a party game in which you distinguish between friends and a liar through conversation.