Watching for second time and 5 episodes in one week, this covers some serious issues facing young adults in school in a convincing way, with a different one in every episode focusing on each character but there is also a running mystery theme about a girl who took her own life and the waves she left behind. It's well acted, I like Hong Jong Hyun's serious, taciturn character as a good guy but some may find his character a bit too forbidding. All the actors portray their different characters very well I feel. Like others I feel it is SERIOUSLY UNDERRATED, maybe because it is such a "hard-hitting drama", with little or no comedy to relieve the tension. My only regret is that the series is so short.