"Yīngsù Huāguān" is an original Luo Tianyi and Kagamine Len song by JUSF. It is a sister song to 向内生长 (Xiàng nèi shēngzhǎng) and 乌合之众 (Wūhézhīzhòng). While Tianyi sings in Mandarin, Len sings in a made up language accompanied with Chinese lyrics. The song is fairly vague, but it is mostly about communication, death, loneliness and eternal life. This song has exceeded 100,000 views on bilibili.