Interesting premise even with a quite simple plot idea. Despite all five characters being 'Ploy', they are all vastly different, and played by very talented actresses. After gmmtv gave us so many BL series, it's refreshing to watch some male actors interact with women again.
The only negative thing is that it's difficult to believe these characters are in high school, since they're all played by already grown up adult actors. But after all, it's just flashbacks so it's forgivable.