讲述了一个表面上玩世不恭的年轻律师薛士奇，意外得到了一部老式手机而跃迁到另一个平行时空，变成了一所高中的音乐老师的故事。在世界线B里的主人公既要面对音乐才华出众，却状况百出的各色学生 又要面对竟然变成自己女友的世界线A里的律所男合伙人…种种阴差阳错展开了一系列啼笑皆非、感人肺腑，同时又脑洞大开的故事线索…
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