嗯，仅此而已。

Yea, that's all it is.

Source: Tatoeba

Sentence Composition

=1 嗯 ēn (a groaning sound)
=1 嗯 èn
  1. (nonverbal grunt as interjection)
  2. OK, yeah
  3. what?
=1 嗯 en interjection indicating approval, appreciation or agreement
=1 嗯 ńg Used as an interjection to express doubt or curiosity.
=1 嗯 ňg Used as an interjection to express surprise.
=1 嗯 ǹg
  1. (dialectal, Internet slang) alternative form of 硬 (yìng)
  2. Used as an interjection to express agreement or pledge.
  3. alternative form of 硬 (yìng)
2 仅此而已 jǐncǐéryǐ that's all; just this and nothing more