I've often seen native speakers use verbs such as 닫아지다, 보여지다, and others ending with 지다 as passive verbs. Did you know that these sorts of verbs are technically incorrect? However, since they're so common, I recommend knowing what they are and how they work.
These sort of verbs are known as Double Passive Verbs, since they're made by taking a verb that's already passive, and attaching the passive 지다 ending - thus making them double passive. However, since there is no such thing as a double passive, they should be avoided in any sort of academic setting (such as on your next Korean test, or when giving a speech).
Are there any other double passive verbs you've learned about? Let me know here, or in the comments below the video~!