I was planning to go back and watch the whole thing but for some reason can’t find it on viki again and can’t remember the name. I believe it’s a fairly recent show
It’s a romantic comedy that’s set in the past so it’s also a costume drama.
The storyline was a girl and a boy meet when they are very young and promise to marry. The boy suddenly disappears and when she grows up she still looks for him. She ends up meeting a prince(?) who she falls for but somewhere in the middle she finds the boy and is torn between prince and childhood promise.
(I saw a little of the end - The girl marries the prince and the boy ends up getting stabbed by evil relative I think while saving her)