The fourth sister of Bi Chunliu, appearing as a young girl on the bus. She has a round face and is called 'Big sis' by Bi Chunliu. She is confused by Bi Chunliu's strange behavior and words, such as 'performance fee' and 'Liu Xu'. She nearly cries but is pinched by Bi Chunliu to stop. She represents Bi Chunliu's deceased family member reincarnated or appeared in the past setting.
