You probably heard of this word in many songs and drama, 약속 (yaksok). This word means promise. It also means appointment or undertaking.
So if you want to say I promise you can say 약속해요 (yaksokhaeyo). Now if you want to ask someone to make a promise you can say 약속하세요 (yaksokhaseyo).
It Started with Hangul 
I’m so glad that I found your site! I’m trying to learn Korean and it’s slow going.
힘내요 (You can do it!)
Thank you for making this blog, it’s really helpful 🙂
HI!
Just wanted to say I love your site! I lived in Seoul for a year, and enjoyed every minute of it. My only regret is that I didn’t learn enough Korean. 😦
Keep up the great work!
Wow i am so envious that you get to stay to Seoul for 1 year. I wish i can have that opportunity as well.
How to say i like it in korean?