12-year-old Lo is invisible in a family that only cares about her sick older sister. So, Lo decides to cure her. But as her sister gets better, Lo only gets worse… 　　Fast forward 12 years, and Lo (now 24) finds herself on board the same subway train she was just about to jump in front of. The crowded train stops in the middle of a tunnel due to a bomb threat, leaving Lo stuck wit... (展開全部)