坏的弟弟：嫂子一个人很寂寞吧

　　An uplifting and heartwarming story about finding the magic of Christmas, no matter where you might be, This Is Christmas follows Adam (Alfred Enoch) and Emma (Kaya Scodelario) as they make their daily commute from the picture-perfect village of Langton to London for work. Every day they share their journey with the same characters, but they all keep themselves to themselves. But then one day, in the build-up to Christmas, Adam breaks the unwritten rule of travel and starts talking to the strangers on the train, inviting the whole carriage to hold their own Christmas party.

 1980年代，我国东南沿海，外轮玛利亚号因连撞渔船、走私船惹上麻烦。夜晚，渔家女闯进包箱，向长谷川船长（王显 饰）索要落水失踪的爷爷。刑警队长司徒明杰（张毅 饰）闻声出现，大副山野（仇晓光 饰）接到“法院传票”，司徒知其有诈。海面上，走私首犯李澍（孙大雨 饰）划桨在逃，司徒驱艇追赶。海员俱乐部里，昔日遭歹徒侮辱的颜红（白灵 饰）看见司徒，转身跑回房间痛哭，舒放（崔智 饰）不怀好意扑向痛哭的颜红，颜红发现舒放正是昔日侮辱过自己的歹徒，她把毒药洒进了水杯。司徒从颜红手中接过写给自己的信，一只掌握犯罪证据的胶卷从颜红发间落下......

　　寅次郎回来通知家人，打算跟他途中相识的单亲妈妈娟代订婚。当娟代失踪已久的丈夫再次出现后，寅次郎留下短信就离开了。在旅途中，寅次郎在津和野重遇旧相识歌子，而她的丈夫刚病逝。基于责任，她与夫家苛刻的父母一起生活。寅次郎劝说歌子来东京，并陪同她去见因反对婚事而对歌子疏远的作家父亲。寅次郎希望与歌子有所发展的意图落空，因歌子决定要奉献她的生命给弱智儿童。