Solo debuts in K-pop often arrive under a particular kind of pressure – especially for idols who have already proven themselves within a group. The expectations are different, and the margin for error smaller.

On 14 January 2026, IN SEONG, main vocalist of SF9, stepped into that space with his debut solo EP, Crossfade. Consisting of five tracks that span just over 15 minutes, the EP is an impressively vulnerable project that explores a quieter range of human emotion. With IN SEONG holding co-writing and co-composing credits on four of the five tracks, Crossfade feels like a rare glimpse into the mind of one of K-pop’s more underrated talents.

Crossfade begins with the EP’s title track, “Mute is Off.” The pop-rock instrumental amplifies IN SEONG’s emotional vocal delivery that allows listeners to imagine the idol as the lead singer of a band. It’s a powerful track to open the EP with, simply due to its sheer honesty. IN SEONG depicts a life where he takes a step back in order to let others shine, becoming a follower in an industry full of leaders.

Through this narrative, he encourages listeners to evolve beyond what they feel may be their set role in society. Letting your true voice and your true self shine after keeping quiet for so long is, if anything, an apt concept for an idol’s solo debut. By singing “Mute is off, the hidden me / Waking up in this moment / At the edge of my trembling heart / I'll call out my real self,” IN SEONG is not only speaking to listeners who have been afraid of revealing their true selves to others. He’s also looking inward – calling to his own inner demons and standing as his most honest, unhidden self. The mute button is no longer an option.

“Feast of the Night” follows as a sort of quiet celebration for the brave steps made in “Mute is Off.” IN SEONG invites listeners to indulge themselves in a moment of relaxation. The easygoing R&B instrumental aligns with this message perfectly, relaxing even those who haven’t taken the extra step to read through the lyrics. “Come, to the feast of this night / Let even your exhausted dreams rest for a while / All the sadness and all the joy / Put them together in our cups.” Not only does IN SEONG allow himself and listeners to pause for three minutes, but he also encourages the difficult act of processing the emotions that kept you from relaxing for so long.

One such emotion that keeps many from relaxing is insecurity. “Trying To Love” and “Stained Memory” explore why insecurity plays such a major role in preventing us from loving and being loved. “Trying To Love” sees IN SEONG working through the process of finally confessing his love and, along the way, learning to love himself. “Stained Memory,” meanwhile, switches gears to focus on the aftermath of heartbreak. How do you think fondly of memories if they’re stained with sadness?

It seems as if he doesn’t quite want to move on from these memories. After all, he worked so hard to get to the moment of confession that he shouldn’t give up so easily on what may be his one true love. Lyrics like “I may be clumsy / But carefully / Step by step / I'm trying to get closer to you” in “Trying To Love” and “Do you miss me too? / Under the same sky / At the end of this longing / There's no one else for me but you” in “Stained Memory” work in tandem to represent the complicated cycle of emotions one finds themselves in when indulging their own desires.

The EP’s closing track, “Still You, Now Me,” is soaked in a nostalgic-sounding instrumental that amplifies its notion of chasing memories into the past rather than moving forward without them. It almost unravels the work that the previous tracks laid bare, but that only makes it feel more realistic.

Emotions aren’t experienced on a straight line. When we feel sad, we can often hope for happiness to follow, but that cycle almost never occurs the same way twice. What IN SEONG displays so profoundly on Crossfade is a beautifully human outlook on life. Nothing extremely exciting or deeply depressing happens beside the mundane portrayal of emotions we all feel on a daily basis. As far as solo debuts go, this is one that should be felt by those far beyond the SF9 fan-base.