I keep using Korean words for some phrases so you can enjoy it better. But for those who doesn't know the meanings, you can use these as a guide. P/s; But the best way to learn Korean words is by watching a lot of Kdrama/Kmovie/Reality show.

Bogoshipda - I miss you
Saranghaeyo - I love you
Yeppeuyo - Pretty (informal)
Yeppeuda - Pretty 
Kureum - excuse me / goodbye
Annyeonghaseyo - hello 
pabo - stupid
napeun saram - “bad” person (but in a good way)
Aigoo - ugh!
Omo - ugh! / oh my God!
Sunbae - senior
Dongsaeng- little brother
Shiro- I don’t want to
Ka - Go
Guerae- Sure/right
micheosso? : Are you crazy?
gajima: don’t leave
Abeoji - Father
Appa - Dad
Eomoni - Mother
Omma - Mom
Oppa - Brother (for girl)
Hyung - Brother (for boy)
Unnie - Sister (for girl)
Noona - Sister (for boy)
Halmoni - Grandmother
Haraboji - Grandfather
Adul - Son
Jinjja - Really
Jugeullae - Do you want to die? / do you want me to kill you?
Khumu - Aunt
Samchul - Uncle
Sachon - cousin
Seonsaengnim - Teacher
Yeoboseyo - Hello
Geojitmal - Lie
Jebal - please
Mianhae - I'm sorry