Soloist Wonho released his first full-length album, Syndrome, on October 31, 2025. 

Wonho is an artist who speaks for himself. He has steadily grown through his vocals, performance, and songwriting, and his global activities have broadened his fandom.

This album traces the reactions lingering in the body and mind after experiencing love: the pulse of the beginning (ONSET), the surging heat (FEVER), and the reverberations after everything has passed (FALLOUT). Instead of grand drama, it depicts the emotional ups and downs through shifts in tempo, tone, and vocal resolution. The composition flows smoothly when listening, and the scenes remain vivid afterward.

The title track, "If You Wanna," is a pop/R&B track with a straightforward message: "If you want, let's get closer now." Resilient bass, tight drums, and synths with a sense of space create a minimal groove, while Wonho's flexible vocals vividly convey the vibrant city night and the burning passion within. From lyrics that speak of choice rather than a game of wits to a concise hook, this song perfectly represents the attitude of this full-length album. The music video showcases chic urban visuals and dynamic choreography. 

'Fun'  is a pop track that exposes the emptiness hidden behind the call to have fun. While it's outwardly presented as a call to have fun, the deeper the emotions, the more complex and painful the inner self becomes. Despite its upbeat title, the bitter lyrics and rhythmic sound realistically illuminate the wounds and sincerity hidden beneath the "fun."

'DND' is an alternative pop R&B track about ending a relationship that has lost oneself in a repetitive pattern. As the title, an abbreviation for "Do Not Disturb," suggests, the track compares a weary heart to the Do Not Disturb mode on a phone.