Mandarin equivalent of hai 係噉㗎嘞? ABC Cantonese defines 係噉㗎嘞 as:


  FIXED EXPRESSION
  accept philosophically the way things are in life; that's life, c'est la vie


And gives the example sentence:


  幸運兒永遠係少數，呢個世界係噉㗎嘞。
  hang6 wan6 ji4 wing5 jyun5 hai6 siu2 sou3, ni1 go3 sai3 gaai3 hai6 gam2 gaa3 lak3
  The lucky people are always few, that's the way the world is 


With some footnotes:


  See also 噉 gam2 係 hai6 係噉 hai6 gam2 嘞 lak3


There doesn’t seem to be a Mandarin translation though and definitions for 係噉 range from:


  不停


To


  如果是这样


Any ideas?
係=就是

噉=這樣

㗎嘞=的啦

it is more appropriate to translate as 就是這樣的啦 in the phrase you mentioned.