This can more accurately be described as a Part 2 rather than a sequel. It's very confusing if you haven't watched the first Believer. The movie begins with a 5-minute recap of the highlights of the previous instalment, and that's the only bit that was entertaining and made sense. After that, it is just one hot confusing mess. It seems like what happened with the first Believer was that it was such a great show, they decided to eke it out.

This movie is not a sequel because it doesn't carry on from where the first one left off. Instead, it's very weird because it tries to elaborate and explain a back story of motivation for characters in the first one and introduces whole new characters. It is NOT a movie per se but more like watching an appendix. Finally in the last 5 minutes, we finally catch up to where Part 1 left off and then it creates an ending because part 1 ended ambiguously.

I got to give them credit for being able to pull out bits of the first instalment to create a deep enough side story, and then attempt to pull it back to the main story shown in Part 1, and then tie up everything at the end. Hence my rating of 4. It's a real pity that the talents of Han Hyo Joo (who wasn't in the first part) have be under-utilised.

In essence, if you did watch Part 1 and wanted to find out what happened in the end, simply watch the first and last 5 minutes of the entire Believer 2. You can thank you now.