An insomniac man hires a "sleep-buddy", who discovers his hallucinations may be real, uncovering a mysterious connection.

Wangxiong investigates his client's past trauma and the mysterious identity of his imaginary friend, Dayang.

Wangxiong makes a pact to stay after finding his client's childhood home, but the hallucination warns him to leave.

Wangxiong gets jealous of Dayang after receiving a key, but Shuguang reveals the ghostly figure is a remnant of his past.

As Wangxiong moves in, conflict over Dayang escalates until he uses the "Sleep God" myth to force his client to face reality.

Shuguang chooses Wangxiong and plans a trip, but taking medication causes a violent panic attack, endangering Wangxiong.

Wangxiong seeks Dayang's advice after being rejected by Shuguang, leading to a role reversal where the hallucination is comforted.

Dayang reveals he is a manifestation of Shuguang's trauma, urging him to choose Wangxiong and move forward with his life.

Shuguang reveals his mother's suicide on his birthday; Wangxiong reveals his own abandonment, sealing their vow to heal.

Shuguang finds closure over his mother’s death and writes a book, as he and Wangxiong make a powerful, permanent commitment.