While playing kRO, it is useful to know basic Korean for either quests, items or partying with others.

• ㅎㅇ - This is pronounced as “Hai” which slang for “hi”
• 안녕하세요 - Formal Hello
• 네 - Yeah
• ㅇㄱ - Slang for “okay”
• 감사합니다 - Thank you
• 죄송합니다 - Sorry
• 어디시죵 - Where are you?
• 아 넵 - Yes
• 알겠스빈다 - Alright
• 헠 - Huh?/Yes?
• 그럼 전 이만 가보겠습니당~ - Then I'll get going now~
• 즐라하세용~! - Enjoy~!

• 떠도는 - Elusive
• 두목 - Ring Leader
• 튼튼한 - Solid
• 빠른 - Swift
• 분노의 - Furious

• Elemental Property
  • 화 - Fire
  • 수 - Water
  • 풍 - Wind
  • 지 - Earth
  • 무 - Neutral
  • 독 - Poison
  • 성 - Holy
  • 암 - Shadow
  • 불사 - Undead
  • 염 - Ghost
• Racial
  • 무 - Formless
  • 불사 - Undead
  • 동물 - Brute
  • 식물 - Plant
  • 곤충 - Insect
  • 어패 - Fish
  • 악마 - Demon
  • 인간 - Demi-Human
  • 천사 - Angel
  • 용족 - Dragon

It is beneficial to hotkey some phrases.

• 격대기 될까요? - DPS Party spot?
• 빈자리가 있습니까? - Is there a spot in the party available?
• 11시에서 버프드릴게요 - I'll buff you at 11 o'clock (map direction)
• 균등하게 분배 - Evenly Distributed (EXP)
• 모며주세요 - Please Gather
• 잠시 화살좀 - Need arrows
• 슬이야 마나를 채원주세요 - Give me mana
• 마나를 - Mana
• 한 10분 자리비워도 되겠습니까? - Can I be excused for 10 minutes? (Log out)
• 화장실좀 갔다올꼐요 - I'm going to the bathroom. (Log out)

• 팜] - For selling an item through megaphones. You can link the item to sell easier. Example: 팜] <의상 화염의 마스터>
• 삼] - For buying an item through megaphones. Example: 삼] 포츈소드 2.7억 which means Buying> Fortune Sword 270 million.
• 개 - Pieces. Example: 200개 means 200 pieces.
• Numbers in Korean - A must read to understand numbering system.

When conducting a trade, the player may ask: “Where are you?”
You should be next to a Kafra so you may respond with Prontera Kafra 3'o clock (프론테라 카프라 3시)

• 윈더구함 - Wanderer wanted
• 격대기 - Grandmaster which means party leader wanted.

Sources:
https://www.koreanfluent.com/cross_cultural/korean_numbers/korean_numbers.htm