Your result
Possible
South Korea is one of the five countries with a working holiday agreement with Brazil, and it has the most generous age range of them: up to 34, where the others stop at 30. So on age you are very likely fine.
The reason we have not simply called this likely is a specific gap in what we could confirm. The foreign ministry's published page lists agreements in force with Germany, Australia, South Korea, France and New Zealand, and states that those in force let nationals of those countries and of Brazil work in the other's territory — which reads as applying both ways. But that page is written for Brazilians travelling out, and at least one secondary listing of the inbound Brazilian visa omits South Korea while including the other four. We could not resolve that from the official sources, and we would rather tell you that than guess.
It is a question with a definite answer, and the place to get it is a Brazilian consulate in Korea, which will say whether the inbound visa is currently being issued to Korean nationals and under what quota.
If it is, expect the common requirements: a valid passport, a return ticket or the means to buy one, reasonable funds for the initial period, and health cover for the whole stay, with the visa obtained before travelling because the residence permit requires it.
Tell us your age and where you are applying from, and we will confirm the inbound position with the consulate before you make plans around it.