This is a jukugo word, which usually means on'yomi readings from the kanji. Since 人 has two on'yomi readings, here's a mnemonic to help you remember which one to use:
Every sick person enjoys playing on their Nintendo (にん). You have the nastiest flu, but you've still got your Nintendo, so everything is fine.
If you don’t want to catch something, you shouldn’t go near sick people.
The fortuneteller told me that my previous life was as a sick person.
"How’s it going?" "Couldn’t be better." "Good. I’m surprised to hear that from a sick person though."