그런 것들은

those things

→ 그렇다
phrase Rare #20,166
those things 그런 means “such” or “like that,” 것 means “thing,” and 들 marks plural. 은 marks the topic.
KO: 그런 것들은 너무 비싸요.
EN: Those things are too expensive.

그런 것들은 다룰 줄 알았다.

I knew how to handle things like that.