二人世界

èrrénshìjiè
  1. world with only two people (usually refers to a romantic couple)
  2. romantic couple's world

CEDICT

  1. (of a couple) to enjoy the exclusive world of two people (without the hassle of children); to enjoy each other's company; to spend quality time with each other
  2. to enjoy the exclusive world of two people (without the hassle of children); to enjoy each other's company; to spend quality time with each other
  3. world of two people (i.e. a couple); each other's company

Wiktionary

Entry Composition

1 二 èr
  1. two
  2. 2
  3. (Beijing dialect) stupid
2 人世 rénshì
  1. the world
  2. this world
  3. the world of the living
3 界 jiè
  1. (bound form) boundary; border
  2. (bound form) realm