On March 21, 2026, Lee Jinwoo, better known as XEN from OMEGA X, released his new digital single F KILLER, marking his second official solo release after 어디서부터 (From Where). While XEN has always been involved in songwriting within the group, this track feels like a clearer step into his own identity, both musically and emotionally.

From the start, F KILLER leans into an R&B and soul sound that suits his voice well. The production is smooth but not overly polished, leaving space for his tone to carry the emotion of the song. Compared to his earlier solo work, this release feels more confident. Instead of trying to prove himself, he sounds like someone who already knows what he wants to say.

What makes the song stand out is its message. Inspired by the “Thinking” (T) tendency from the Myers-Briggs idea, the lyrics focus on choosing honesty over forced empathy. Rather than romanticizing relationships, the song talks about the exhaustion that can come from always saying what people expect to hear. That theme gives the track a realistic edge, and it makes the listening experience feel more personal. It doesn’t try too hard to be dramatic, which actually makes the emotion land better.

XEN’s growth as a songwriter is noticeable here. Fans who followed his work on OMEGA X songs like “CONTROL,” “JUNK FOOD,” or “ISLAND” will recognize the same style of storytelling, but F KILLER feels more direct. There’s a sense that he’s less worried about fitting into a group sound and more focused on expressing his own perspective.

The timing of the release also adds to the momentum. After finishing OMEGA X’s first European tour and meeting fans across multiple cities, this single feels like a way for him to reconnect on a more individual level. The small release event in Seoul after the song dropped makes the project feel personal rather than just another comeback.

Overall, F KILLER feels like a very natural step for XEN as a solo artist. The song focuses on his vocal color, his writing, and the emotions he wants to share without trying to do too much at once. That simplicity makes the track feel sincere, and it shows how comfortable he’s becoming with his own sound.