Tsuki

Tsuki — born Fukutomi Tsuki on 21 September 2002 in Japan — is a member of the South Korean girl group Billlie, where she has built a visible public profile that extends well beyond the recording studio. While the group's musical output anchors her career, her expanding presence on Korean variety television has drawn its own wave of attention, most recently through a panelist seat on tvN's dating reality series *Heart Signal 5*.

From the group to the screen

Tsuki's variety turn on *Heart Signal 5* marked a notable solo step for a member whose identity has remained closely tied to Billlie as a unit. Participating as a dating show panelist for the first time, she described the experience of giving opinions on other people's relationships as "an exciting and fun new experience" — a candid admission that the format was genuinely new territory. The appearance generated enough momentum that, at the showcase for Billlie's first full album in May 2026, Tsuki named tvN's *You Quiz on the Block* as her next ambition, though she was clear she wanted that appearance to happen as a group, not alone.

Activities beyond music

Her schedule in the first half of 2026 reflected a broadening activity range. In April 2026, Tsuki appeared alongside WayV and SuperM member Ten in the global web variety series *SOLD OUT*, where the two spent a day as honorary members of Kukkiwon — the World Taekwondo headquarters in Seoul — performing training drills and an outdoor demonstration. The segment drew comment for the athletic ability both displayed on camera.

Around the same period, ahead of Billlie's comeback, Tsuki offered a candid detail about how the group managed their physical condition during preparations: she personally controlled swelling by eating sushi, a small disclosure that nonetheless circulated widely and illustrated the kind of unguarded, personality-forward content that has made her variety appearances land with audiences.

Standing within Billlie

Tsuki is one of the Japanese members of Billlie, a group notable in the fourth-generation girl group landscape for its multinational composition and for a conceptual identity that leans into the surreal and the cinematic. Her nationality and ease on camera — she speaks across the language divide that variety formats can make awkward — have positioned her as a natural bridge figure both within the group and in its outward-facing promotional work. The desire she expressed to bring the full group to *You Quiz on the Block* is consistent with that orientation: solo visibility, channeled back toward the collective.