I’m not using the official recommendation feature for this since I can’t in good conscience recommend the second half of Hi! School - Love On to anyone, but for those who enjoyed the first half, consider checking out the web drama Secret Angel. It’s got the same general idea for the plot and it’s a sweet story with a positively charming female lead. Its total runtime is only about two and a half hours so there’s not as much detail, but it also doesn’t drag on for several hours longer than the plot calls for.
https://kisskh.at/4177-secret-angel