來自21世紀的項少龍（古天樂 飾）曾意外穿越，并助秦王（林峯 飾）一統天下，這段跨越時空的宿命糾纏將兩人緊緊捆綁，兩人也成為亦師亦友的情感羈絆。然而，在項少龍歸隱田園多年后，未知穿越者卻驟然降臨，大國基業陷入傾覆危機，秦王不得不求助于早已不問世事的項少龍。面對足以顛覆歷史的強敵，他們能否放下芥蒂聯手抗敵？那段摻雜著師徒之恩、君臣之畏與知遇之情的情感，又將成為保護彼此的鎧甲，還是刺向對方的利刃？                        

　　Driving home late at night during a heavy rainstorm, Glen experiences car trouble. Near where his car gets stuck, he spots a house, knocks on the door and is greeted by an oddly friendly middle-aged man, Arthur, and his younger wife, Cyndi. The strange couple pours him a drink, and then more drinks, followed by an unexpected offer that Glen can’t refuse. Elsewhere, a young woman, Katie, is feeling emotionally weighed down by a secret romantic arrangement that feels like a textbook case of gaslighting. And at the same time, in a nondescript research facility, medical professional Julie begins questioning her role in a bizarre experiment, fearing that she’s doing more harm than good.

總兵石須龍之子石倫強搶秀英，匡忠出手相救、拉開寶弓，二人因弓結緣。秀英、匡忠逃跑途中互生情愫，二人在識破石須龍貪污軍餉罪行的過程中重新認識彼此、相知相愛，聯合月英帶領的二龍山眾兄弟打倒石須龍。

 十年前，發生了震撼世界的重大事件“第一次愛之夏”。蘭頓失去了他的父親阿德洛克，現在已經在邊境城鎮貝爾福雷斯特參加了塔州聯盟軍校。被稱贊為英雄的已故父親。 什么都沒有的單調日常。蘭頓身邊的一切都很悶。 但在蘭頓面前，世界上最古老的LFO尼爾瓦修突然出現。 從駕駛艙出 現的是優萊卡。蘭頓和優萊卡的旅程將在哪里結束？