For most of the last three years, the most clever, artful and progressive act in K-pop has been NewJeans, a five-member girl group — Danielle, Haerin, Hanni, Hyein and Minji — with an almost preternatural musical and aesthetic sophistication. With one elegantly rendered chart-topping single after another, the artists, who range in age from 16 to 20, seemed invincible.

       Which is why the group’s announcement, last November, that it wished to terminate its contract with its label and management agency, Ador — a sublabel of the K-pop conglomerate Hybe — was such a watershed moment. NewJeans said that its differences with the company were irreconcilable, and that it would move on separately.

       Ador took exception, leading to back-and-forth legal fusillades. (A lawsuit about the validity of the contract will begin with a hearing on April 3.) Last month, NewJeans’ members announced they were taking on a new name, NJZ, and that the group would perform for the first time under that moniker at ComplexCon Hong Kong, which took place this past weekend.

       Two days before the performance, though, the Seoul Central District court approved an injunction requested by Ador that precluded NewJeans from participating in or initiating any new commercial activity as NJZ. A representative for the group said that it would appeal.

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       Ominously, a statement from Ador said it would have representatives at the Hong Kong show: “We will be fully present at ComplexCon this weekend to guarantee the performance is presented under the NewJeans name. We eagerly anticipate meeting with the artists for a heartfelt conversation at the earliest opportunity.”

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       Minji performed Upsahl’s “Smile for the Camera,” a charged pop-rock song about chafing at authority. Credit...Lam Yik Fei for The New York Times

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