Type
Genre, Lineage
suffix
Trace something back through its lineage to determine what type of thing it is.
〜系 is a suffix you can attach casually to a word to classify it as a genre or group, like 理系 (science-oriented fields), おしゃれ系 (trendy or stylish people), or 日系 (Japanese descendants).
The reading is the same as what you learned with the kanji, probably because this word gets stuck onto other things to describe tribes and groups.
私の町には韓国系アメリカ人がたくさん住んでいます。
There are a lot of Korean Americans living in my town.
私は恋愛系の映画が好きだけど、ホラー系は苦手です。
I like romance-type movies, but I'm not good with horror ones.
草食系か肉食系かと言ったら、アキオは絶対肉食系でしょ。
If you were to ask whether Akio is a herbivore-type or a carnivore-type guy, he'd definitely be the carnivore-type.
私、アキバ系のオタッキーな男性に何故か魅力を感じるんだよね。
Somehow I'm attracted to nerdy, Akihabara-style men.