《여름이었다》（夏天）是由JAEHA (재하) 和 Chan共同创作的一张专辑。这张专辑融合了多种乐器的美妙演奏，包括The TRINITY负责的钢琴 电吉他 贝斯 合成器和鼓，以及나원호演奏的电吉他和原声吉他。和声部分由JAEHA (재하)、Chan 和 려진共同完成。专辑的摄影由hidongki负责 视觉设计由LEERYAN完成 录音和混音工作则由황세현和전찬민在우대패밀리 찬민이방完成 母带处理由권남우在821 Sound Mastering完成。 여름이었다 Written by JAEHA, The TRINITY, Chan Composed by JAEHA, The TRINITY, Chan Arranged by The TRINITY Chorus by JAEHA, Chan, 려진 Piano by The TRINITY Electric Guitar by 나원호 Acoustic Guitar by 나원호 Bass by The TRINITY Synth by The TRINITY Drum by The TRINITY Photography by hidongki Artwork by LEERYAN Recorded by 황세현 @우대패밀리 찬민이방 Mixed by 전찬민 @우대패밀리 찬민이방 Mastered by 권남우 at 821 Sound Mastering