Did you know Baekhyun's song, My Time/Every Second the OST from Record of Youth, was composed and arranged by an 18 year old? The producer is Kim Junwook (HONEY NOISE) who used to be part of the kpop band, The EastLight, and he was also literally a guitar prodigy 
A song he composed when he was ~12 for a competition:
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A more recent composition
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