Did you see School 2015? The greatest emphasis, time, and emotional connection was given to the secondary characters. The screenwriter carried this connection and hope until the very last seconds. The actors (the female lead and the secondary lead) even won an award for best couple at the time. The male lead (now popular) suffered a lot of criticism for his acting and had little relevance in this drama... China and Thailand made remakes of the drama, modifying some aspects that didn't make sense in the plot.