北冥有鱼南海有鲛
[bĕi míng yŏu yú nán hăi yŏu jiāo]
'Bei Ming You Yu Nan Hai You Jiao', derived from classic literature - the mythical story of Kun becoming a giant bird. In Zhuangzi, 'there is a fish named Kun in the North Sea; there are mermaids in the South.' Using this indicates appreciation towards mythological and classical narratives about transformation or the coexistence between fantasy elements.