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During the January 20 episode of 'The Unit', the Uni+ G Green team were practicing for their "Sweet" performance which required a sexy concept. While doing so, Lee Suji became shy and timid, and quickly gave up for a moment. Afterward, the former member of The Ark conversed with Euna Kim who lightly scolded her.
Lee Suji explained, "I don't know when I started to lose confidence in myself. I think it occurred since The Ark disbanded. I don't feel like myself and became a lot quieter compared to back then."