It's the epilogue of My Love from the Star, soo you should watch it. It's small but gives closure to the drama.

This is the chinese remake, so it has the same storyline, however the chinese version is longer and covers aspects that this one doesn't. I recommend it if you have a lot of time to spare.

Another ad from the Lotte Duty Free Mall.
Exact same concept as 7 First Kisses, just a different story and actors.

They both have as the main story a romance between a South Korean female and a North Korean male and government plots. The main differences are the time frames and the overall approach.
Snowdrop seems darker and has little romance, giving more importance to the governmental aspect. Crash Landing on you is the opposite, with more romance, comedic scenes, and a brighter approach.