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The "YeSisters," also known as the Cute Line and the Birthday Line, are composed of the members Yerin and Umji. Both members have the same character "Ye (예)" in their first names. Additionally, both are born on the same day (August 19th). Umji has stated that she doesn't like Yerin's pranks, as Yerin's pranks consist of biting, kissing with lipstick before going to their next schedule, and more - contrary to SinB who "handles it well," according to Umji herself.