A global scientific summit debates and fails on a plan to stop a massive asteroid heading straight for Earth, with all countries blaming each other for the impeding disaster. With communications tense...

　　在该剧的最后一季中，自由高中的高年级学生正在为毕业做准备。但在告别之前，他们不得不埋葬一个危险的秘密，并面对可能永远改变他们生活的心碎抉择。...