벼룩의 간을 내 먹다

`벼룩의 간을 내 먹다' Byeo Luk uei Gan eul Ne Muk Da.

`Eat the liver of a flea'

A sarcastic expression for being greedy for such small things.

A sarcastic expression for trying to profit from such small things.

간에 기별도 안 간다

'간에 기별도 안 간다’  Gan ae Gi Bul Dou Ahn Gan Da. 

간에 기별도 안가겠다. Gan ae Gi Bul Dou Ahn Ga Get Da.

The expression 'the message that you ate food doesn't even reach the liver in one's Boby inner system, due to you ate so little.' means that the amount of food eaten was too little and did not reach the liver.

간에 기별도 안가겠다.

You ate too little food. So you should eat more.

Or

I ate too little food. Now I want to eat more.