Sarah is your primary school classmate. She is always quiet and does not have any close friends.
Recently, Sarah has been absent from school for several days in a row. Before class ended, the teacher entrusted you, as model students, to deliver her schoolwork to her house. You headed to Sarah's house where her family warmly welcomed you, but you never caught sight of Sarah... You could not shake the feeling that this visit might have been a one-way trip...