It was a shounen-ai or yaoi (I can't tell which genre because I only read the first 3 or 4 chapters and the story was still building at that point). I can't remember if it was a manga, manhwa or manhua. The first chapter was full color, if I'm not mistaken, but then it turned to the classic black and white style. The main character was a black-haired male student (I'm not sure if he wore glasses but I think he did ?). He was the classic small, cute and shy boy you can find in shounen-ai and yaoi manga. One day a new student with orange hair got introduced to the class and he sat near the MC. He was pretty popular since the beginning because he was handsome and cool around people. The MC and the new student came to feel a little attraction for each other. An unpleasant female rival got introduced between the 2nd and the 4th chapter. I think that she had cram school or something similar with one of the two boys (?).
The style was really cute and the colors used in the full color pages were all pastel (like this).
I read it on a site like Lehzin were you need coins to unlock the chapters.
This is all I can remember. I really hope that someone can help me
