NJ（吴念真 饰）是个很有原则的生意人，同妻子敏敏（金燕玲 饰）、女儿婷婷（李凯莉 饰）、儿子洋洋（张杨洋 饰）以及外婆住在台北某所普通公寓里。小舅子一场麻烦的婚礼过后，因为外婆突然中风昏迷，他迎来更加混乱的日子。
敏敏要在公司、家里两头跑，时常感觉自己要被耗空；婷婷一直为外婆的中风内疚，恋爱谈到中途发现自己不过是替代品；NJ更是麻烦重重，公司面临破产，他又不愿放下别人眼里一文不值的自尊。一家人里，似乎只有洋洋没有烦恼，他平静地用照相机拍着各种人的背面，帮他们长出另一双眼睛。然而，洋洋简简单单的一句话，道出了更深的悲凉……

Set in the island Kinmen, often seen as the most dangerous military base because it’s geographically close to China, "Paradise in Service" follows the adventure of a boy who serves his military service in Unit 831 from 1969 to 1972, in preparation for a war that could erupt anytime. Through an unlucky lottery draw result, Pao, a twenty-something young man from Southern Taiwan has to serve the military in the remote and perilous Kinmen. Moreover, he is assigned to the Sea Dragon (ARB), a unit noted for the toughest physical training. It never occurs to Pao, however, that the greatest challenge in his military service lies not in the Sea Dragon but in Unit 831, a special task he is later appointed to… In this peculiar assignment, Pao vows to keep his virginity against all odds.

A boy experiences first love, friendships and injustices growing up in 1960s Taiwan.

品味新闻台编辑台主管宋乔安（贾静雯 饰）的儿子是二年前李晓明无差别杀人事件的罹难者，她先生刘昭国（温升豪 饰）是网络先驱报的创办人，夫妻在儿子走后因现实磨难渐行渐远，已经走到了离婚边缘。他们11岁的女儿行为日渐失序，为了女儿着想，二人被迫重新检视自己身上的伤口。李晓明的辩护律师王赦（吴慷仁 饰）在他死刑定案之后，仍想要了解其犯罪动机。锲而不舍的王赦，开启了众人命运的连结……