I'm not an expert in Korean (yet), but I think you can say: 잘 지냈어(요)? Chal chinaess-eo(yo)? (Chal Chee-nay-saw?) *The yo at the end makes it less casual and more polite, but you can skip it when talking with friends. 잘 지내십니까? Chal chinaeshimnikka? (Chal chee-nay-shim-nee-gha?) *This is more formal and very polite, so you can use it with people older than you. Good luck in your Korean studies! ;)

It's 잘 지냈어요? Jal Ji Net Sso Yo? So In General, 잘 지냈어요? Jal Ji Net Sso Yo? To your friends or people younger than you: 잘 지냈어? Jal Ji Net Sso? And you can say : 잘지내? Jal Ji Nae To older people or higher rank people: 잘 지내셨어요? Jal Ji Ne Shut Sso Yo?