This series makes four episodes feel like fourteen.
Not only is the story mundane and based on a clichéd, illogical premise, but also the way in which it is presented is boring. So many scenes drag that halfway through episode two I started yawning.

Furthermore, the acting is subpar, especially Tee's. The only one who does a good job is Bever, but his charming performance is not enough to compensate for the awkwardness and lack of chemistry between his character and Tee's.

The one great thing about this series is its positive representation of women. I liked that the production team chose an actress who is beautiful in a realistic way to play the pretty net idol Mook. It is high time the entertainment industry stopped promoting the idea that only actresses who look like flawless dolls can fit into the beauty standard. Kudos to the production team for challenging this harmful stereotype.

Overall, though, 21 Days Theory is predictable and forgettable. I did not finish it. There was simply nothing that could keep me interested.