Why is Shin Ryujin called the oscillator brother?

Shin Ryujin usually acts like a man, and his personality is a bit like a boy.

Because her name is Liu Zhen, fans gave him a name called Brother Vibrator, which is more friendly and pleasant to listen to. In addition, Liu Zhen usually behaves like a man, and his personality is a bit like a boy. He was also handsome when he danced in the men's team, so he was called Zi Zhenge.

Shin Ryujin, whose stage name is Liu Zhen, was born in Gangnam-gu, Seoul, South Korea on April 17, 2006. She is a Korean female singer and a member of the female singing group ITZY.