Originally I had high hopes for this drama but it turned out to be quite disappointing.

At first the drama seemed interesting and I liked the idea of a love story between two people who have been friends since childhood but are now facing the reality of unrequited love. However, I felt the execution fell flat and the storyline became cliche and predictable.
One of the major issues I had with this drama was the lack of character development. The two leads, who were supposed to be childhood friends, had zero chemistry on screen. Their interactions felt forced and lacked depth, which got really annoying.
Also the pacing of the drama was too slow, and it felt like the story was dragging on without any significant progress. The supporting characters were also underdeveloped and irritating.
Another aspect that disappointed me was the lack of originality. The plot was filled with many random and unnecessary events.
The acting was mediocre. While the actors did their best with the material they were given, It wasn't enough to save the weak script.

On a positive note, the OST was not the worst

In conclusion, Dear X who doesn't love me had potential, but failed to live up to it. The lack of character development, slow pacing, unoriginal plot, and mediocre acting made it a disappointing watch for me.