Well one difference is that he will never be able to find a decent job once released. Unlike our PC bullshit society which allows second chances to these pricks, Korea is less forgiving.
He'll be lucky to find a job cleaning out the local bomb drops at some of the bars. Don't be surprised either if he has an "accident" that would lead to his demise once out of prison.
7 years is too little....wayyyy too little.
He's pretty much ruined this poor child's life. He deserves to be jailed for at least 10 or more years.