High school romance kdramas

I'm looking for high school romance kdramas.

I just finished watching Spring Fever and really liked the second couple. I found them cute and it made me want to watch a high school romance kdrama like it. The couple was really sweet and charming.

I want it to be a sort of friends to lovers senario, where they know each other and/or are friends and their romance slowly grows. Preferably I would like it to stay in the high school time period for most of the kdrama if not all. I also don't really want actors who don't look like high schoolers at all and completely stand out, although I would not mind that so much. Honestly, I just want a cute happy high school romance.

The sort of vibe I'm going for is kinda like seasons of blossoms, dear m (not a high school romance) and spring fever (second lead romance)

So far I have watched doctor slump, head over heels, happiness, Cinderella at 2 am, flower or evil, the glory, and all the ones listed above. I think I enjoyed doctor slump and head over heels the most. I also really liked happiness and flower of evil though.