Congratulations! Keep it up!
If your friend or acquaintance opens a store or sets up a business, you can say like "Congratulations! Keep it up (or) Keep the good work!"
It can be said in Korean as below.
축하합니다.[chu-ka-ham-ni-da]
축하[chu-ka]: congratulation; celebration
대박나세요! [dae-bang-na-se-yo]
대박[dae-bak] is commonly used Korean slang term that means "jackpot" and can be used to express surprise, happiness when something good or cool happens
ex) When you watch delicious food, "Daebak, that looks so good!",
When you learned a secret relationship at the workplace, "Daebak! I knew it!"
When you come across your friend's super-handsome boyfriend, "Wow! Daebak!"
번창하세요![beon-chang-ha-se-yo]
번창[beon-chang]: for an organization, activity, etc. to flourish; to prosper
