Very often happen – especially at the beginning – to see a Korean drama and to hear some words but not to figure out what they mean.
For this reason I have drawn up a list of the most common terms that you should know if you are learning Korean.

• Ahjumma / 아줌마: an older woman, typically the age of a mother or an aunt but not your relative.

• Ahjusshi / 아줌씨: an old man, typically the age of a father or an uncle, but not your relative.

• “Aish!” / 아이씨: expression of frustration and irritation.

• Ani|Anyo / 아니|아니요: No.

• Annyeong / 안녕하세: “Hello” when you are near someone; “Goodbye” but informal.

• Annyeonghaseyo / 안녕하세요:”Good morning” and “Goodbye”, formal.

• Annyeonghigyeseyo / 안녕히 계세요 세요: Goodbye (“I will go first”)

• Babo / 바보: Stupid.

• Bagel Girl: Girl with young face.

• Byungtae / 벼태: Pervert.

• “Daebak!” / 대박: “Impressive!”

• Deh: Yes.

• Dongsaeng / 동생: Younger person than you.

• Fandom: Fan club

• “Fighting!”: “Good luck!”

• Flower Boy: Boy with female features.

• Gomawo / 고망워: Thank you.

• Hoobae / 후배: person who is your junior.
• “Hwaiting!”: “Good luck!” (written this way since Koreans have issues with “f” sound).

• Kamsahamnida / 감사함니다: Thanks.

• K-Pop: Popular Korean music.

• Maknae / Magnae / 막내: literally means “the youngest”.

• Neh / 네: Yes.

• Oppa / 옵바: used by girls to refer to older boys / brothers.

• Sarang / 사랑: Love.

• Saranghae / 사랑해 : I love you.

• Sasaeng / 사생:  stalker.

• Sunbae / 순배: person who is your senior.

• Ulzzang / 울짱: “Best face”; used when referring to a person who has gained fame because of their appearance, typically on the internet sites.

• Yeh: Yes.

These are terms that you listen most often when you see a drama.