Baek Yeo-Min is one of Yeo-Ryeong's haters and bullies in middle school. She has a habit of badmouthing Yeo-Ryeong in the girls' bathroom, which is how Dan-I meets her.
Baek Yeo-Min has a two-faced personality. She can act sweet and friendly when she wants to, but is known for having a poisonous tongue. She badmouths any girl she takes a disliking to, and does so openly.
(Source: Inso's Law Wiki)
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