Some reviews have stated that this movie had many plot holes and a lack of complexity in the storyline. To a certain extent, I agree. The characters have extremely interesting backgrounds, and expansion on them would have been excellent. However, this is a two-hour movie. Every second was packed with action and continued the storyline, there was no filler.

That being said, I really enjoyed this movie. It was quite amusing because I watched it with my family who has no interest in k-dramas, yet are extremely into sci-fi, and they enjoyed it possibly even more than me. I'd recommend it to anyone who likes sci-fi, k-dramas, or both. It was very fun to watch!