This was as advertised, literally nothing else happened.

Both couples are shown after a year of dating, with Yi coming back to Thailand and meeting with Plaeng, and Gene and Nuea navigating their relationship after a year of dating.

They decorate the café for Christmas, teach each other how to make coffee and play the guitar and discuss stuff that happened over the past year and also what they have in store for them in the future.

There are two episodes, the first featured Yi and Plaeng, the second featured Gene and Nuea. Besides a ton of cute moments and a lot of conversations, there wasn't quite much else.

Also, this is the follow up to the finale of Coffee Melody, and in retrospect, it's a choice. The finale did have some updates on all the characters, but I would have preferred them in the special as well. It's just a weird production, a finale that didn't feel like one and a special that didn't feel like one either.