Last year, 3 of the 5 members, including Jejung (23), had conflict with their management company when they filed to suspend their long-term, exclusive contract. Their activities in Korea are on hiatus, but the 5 members are still performing together in Japan.
Even so, at last year's New Year's Eve Kouhaku Uta Gassen, it was observed that the 2 members including the leader, Yunho (23), appeared to be unmotivated, and viewers were exposed to the deepening rift between the members.
Translation credits: mandasoh @ tohosomnia
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Finally, a response from Japan.