(Oba) is the pronunciation of the word "brother" in Korean/Korean, which is only used by women to refer to men.

OPPA can generally be used in the following situations:

First, it is a closer brother, a brother, called ??;

Second, although there is no blood relationship, but the friend who is close to him, and who is a few years older than himself, can also be called??;

Third, girls often call the person they like to the person they like, and they also call the male star they like (which is equivalent to what we call "dear" in China).

Also, generally the other party's name + oppa just means that the relationship is better, not directly called?? Come to the dear.