双向监禁 (Shuāngxiàng Jiānjìn)

Background
"Shuāngxiàng Jiānjìn" is an original Luo Tianyi and YANHE duet song. It also features Yuezheng Ling, who was given a "voice" and was featured as a back up singer for this song. It was then announced that JUSF and Sya will have Ling's true voicebank featured into the song once she released.

Tianyi kills Ling out of pure jealousy and she mailed only her head to YANHE in order to imprison him. But the plan backfires as she was arrested by the police and as a result, YANHE was sent to an asylum as the experience became maddening for him.

The song is the fifth song of the Bidirectional Series, a collaboration between Sya and JUSF. After Ling received her own voicebank in 2015, her vocals were used to sing the song in the album, Shuāngxiàng·Lúnhuí yǔ Xìngfú (双向·轮回与幸福).

This song has exceeded 100,000 views on bilibili.