Formality level to congratulate a close friend on their wedding engagement? My best friend just got engaged, and I would like to send them a nice note. I'm trying to figure out the appropriate level of formality for the conjugation. I know the lowest 해체 form is often used between close friends, but will that convey the appropriate level of respectful courtesy for a wedding engagement? On the other hand if I go too formal will that not convey that we are close friends? Is this my best option? 약혼을 축하 드려요 ! This one seems very casual. Is it too informal? 약혼을 축하해 ! I've seen two different version of the verbs, one of which I believe is the honorific 드리다 form. They look something like this. Should I use the second version to add a little pomp? 축하하 (다) 축하드리(다) Is it possible to use some sort of combination of the honorific second verb version with the informal tense? Like this if it makes any sense: 약혼을 축하 드려 ! I'm new to Korean (basically just learned the alphabet), so this question might not make a lot of sense. Thanks for any advice!