'Door' is an album that is filled with Chen's emotions, to the point that he is credited for five out of six songs. The track 'Flower Seed' in particular is even more meaningful because he participated in writing the lyrics with Baekhyun. Chen said, "Baekhyun was busy preparing for his solo concert, but he readily offered to work with me. I think I was able to come up with great lyrics thanks to Baekhyun, so I felt reassured and grateful." He expressed his deep affection.
https://m.entertain.naver.com/article/477/0000502491
Baekhyun participated in writing the lyrics for the song "Flower Seed"
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