This series stepped up the game of Korean BLs. From plot to production quality, to acting, it charms, touches, and entertains, while managing to avoid clichéd tropes, misogynism, and toxic relationships.

The whole cast delivered brilliant performances. I usually notice weak acting quickly, and I cannot overlook it. This is why I am impressed that in no scenes did I feel like any of the actors is lacking.
Park Seo Ham deserves special praise. Watching him was such a satisfying experience for me. It is rare that I see actors pour their whole hearts into their role, but it is obvious that Seo Ham has done so. Kudos to him.

The plot of this series shows that you do not always need a unique storyline to hold the viewers' interest. Jae Young and Sang Woo's story is a typical high-school enemies to lovers romance. However, the way in which it is told distinguishes it from similar stories.

The characters are likeable.
Jae Young breaks the stereotype of a popular student. Although he teases Sang Woo relentlessly in the beginning, he is not a playboy or a bully. He is a kind person and a talented designer, who quickly wins the viewer's heart.
High-achieving students might see themselves in Sang Woo. Focused on doing his best at school and pursuing his dream of becoming a game developer, he has not spared time for human relationships and has remained emotionally immature. His character development conveys an important message. As much as he has trained himself to think and act like a computer, Sang Woo learns that always prioritizing your ambitions over the good people who are there for you paves your way toward a lonely, miserable life.

The romance is sweet, realistic, and healthy. Despite the misunderstandings that they have to deal with, they both work to resolve their conflicts instead of acting illogically to create more drama. Kudos to the scriptwriters.

The highlight of this series for me were the OSTs, though. It is rare for a BL series to have such great, catchy songs. Romantic Devil became a favorite of mine. I still listen to it, although I watched this series months ago.

Overall, Semantic Error should definitely be on your list if you are into well-written BL romantic comedies.