For the last year and a half, Omar Kenawi and his girlfriend Sue Schlegel have been in a long-distance relationship, sometimes going months at a time without seeing one another.

But when Omar popped the question to Sue on Sunday in Los Angeles, he was able to use their LDR to his advantage.

Sue was told she was needed for a marketing "job" at the Griffith Observatory while Omar was away in London -- or so she thought. While she was working, an a cappella flash mob breaks out singing a rendition of "Seasons of Love" from "Rent," her favorite musical.

Mid-song, Omar makes his entrance, taking Sue completely by surprise. Oh, and if this wasn't already sweet enough, Omar even re-wrote the lyrics to the song and tailored them to their relationship (you can read them here). Watch the video above to see her very adorable reaction to the whole thing.

Only went and got ENGAGED! Sue said yes! You've made me the happiest man alive :D pic.twitter.com/RXCMruVJIq

- Omar Kenawi (@omi1kenawi) September 22, 2014