Of course it is his personal life, and he should not have to apologize for what he does in his personal life, but I guess if he wants to keep his job as an "actor," and try to keep his "fame," then that is why apologized in that manner so that his "boss" or whoever may have sympathy towards him and not fire him? LOL...
Well, if you were a celebrity and you ignored this kind of scandal, especially in Asian entertainment, most likely big entertainment labels may not want you to work under them, which means that your fame will go down because you will no longer be seen on screen and talked about in that way. I am not saying that that this always applies to people involved in scandals, but if you were a big entertainment label in your country, would you like to hire someone under your label who has been involved in a scandal or scandals? Probably not...
I guess, we all know that our favorite celebrities are not as innocent as we think that they are, but it is better to lie to ourselves by not seeing proof then actually seeing proof? If anybody knows what I mean? LOL...