As a fellow Korean as well, I'd like to say just a couple of things.
1. The sentiment presented by these kids' drawings do not reflect all Korean sentiment. It does, however, underline feelings and grievances still left unsettled between Korea and Japan. As mentioned before by Doggie Kruger, Japan has made attempts to "rectify" their mistakes, but they are wanting in sincerity. Most recently, Emperor Akihito and his wife visited the "Banzai" cliff in Saipan, and stopped to pay tribute to the 1000 or so Koreans who also lost their lives in the battle of Saipan. BUT, before we can smile at this, it was revealed later, that the original visit was initially unplanned and only done after Koreans residing on Saipan threatened to revolt in response to the royal
visitation.
Dokdo : is another sore area, one that I'm afraid, is a legit claim. Japan is not making things easier for herself or facilitating reconciliation either.
Most Koreans harbor such feelings, even after all this time (almost 5 decades later), towards the Japanese because there hasn't been a system-wide effort to sincerely apologize and reform. The issue of modification of textbooks and such, that is really not a huge issue. Heck, even US can be accused of skewing such details, etc. Every country is almost guilty of pandering the propaganda to favor themselves; it's only obvious.
What I think most Koreans would like to see is a genuine effort, from top down, to deal with these issues as German has. Germany has been exhorted finally from their part in that World conflict, but their efforts are extant and quite earnest. Koreans have yet to see such from Japan.
That is not to say that such advances has not been made. The descendent of an assassin who inflitrated the last Empress's palace - Queen Min, made a trip to her resting place and offered apologies and condolences on his descendent's behalf. This is a start and one which many hope will begin to set a precedent. While some koreans took this gesture to heart, others sadly did not. I do not condone the actions of these Koreans as well - if reconciliation is to happen, it must be a joint effort from both sides.
Lastly, there is still the matter of the generation which suffered under Japanese Colonization. Most, as it has not yet been too long since this occurred, are still alive and remember that era. For many, the pain and memories are fresh.Before any real steps are taken to begin reconciliation, these and members of such must pass away.
I did not live during those times, but I hear the stories and have studied such, but in the end...we're all human. It's in Earth's way and cycle to commit atrocities against one another, but that doesn't mean that's the end. I hope that eventually the two will reconcile. Dang this got long...sorry for the essay.