Not only... but also, In addition to, Not just
This expression indicates that in addition to the fact stated in the preceding clause, there are additional facts stated in the following clause. Note that when the content of the preceding clause is positive, then that of the following clause must be positive, and when the content of the preceding clause is negative, then that of the following clause must also be negative.
1. This expression can be replaced with -(으)ㄹ 뿐만 아니라 without a major change in meaning.
2. However, while -(으)ㄹ 뿐만 아니라 changes to the form 뿐만 아니라 when used with nouns, -(으)ㄹ뿐더러 cannot be changed to 뿐더러 when used with nouns.