“Before doing …” in Korean

In Korean, a clause may be temporally positioned as following some state or event using the noun 전 ("before") with the location-marking particle -에 to form an adverbial phrase. The phrase in "[phrase] 전에" ("before [phrase]") should be a noun.

The [v.st.]기 form of nominalisation is often used with the 전에 pattern.

저는 기쁘기 전에 피자 다 먹어야 돼요.

Before I can be happy, I must eat all of the pizza.