Korean here I want to post some of my thoughts.

Maybe some who will read my comment may have seen my other comments before but I personally think my view lies on the moderate side when it comes to Korean-Japan relations so with that said let me give the "moderate's" POV.

1. The most important thing to note is that its always the loud ones who gets heard, regardless of the silent majority. You agree not all Japanese hate Koreans right? Same on this side of the sea, not all Koreans hate Japan.
2. I have to disagree on the work culture. My friends living in Japan and one of my family who used to live in Japan (this family member moved back about 10 years ago however) all agreed how strict workplaces are. How they always have to look busy. Japan's suicide rate has gone down drastically and I applaud the Japanese governments actions for fighting against suicides, Korea definitely needs to work on that still (too bad mental health care is still behind in the East). But if you look at this chart, you can see how compared to the rest of G7, Japan's suicide rate was and still is high(got nothing compared to SK though), that's why suicide is so often brought up as a issue. Workplace stress and overtime has often been pointed out as a cause of high suicide.
3. About 99% of the non-kpop fandom will tell you the kpop fandom is cancer, I'm Korean and find it cancer, these are basically the Korean equivalent of "weeboo", the ones who think Japan can do no wrong, of course Korea can do wrong, kpop fans are so cancer that my kpop-liking friends pay extra when they go to concert to sit away from the rest of the fandom.
4. Regarding the apologies and Yasukini. Yes we know the temple hosts others besides war-criminals, we also know there's a temple complex dedicated to foreigners who fought for Imperial Japan as well, but the important part that most foreigners emphasize (besides the hardcore ones who view the very existence of the shrine as a sin) is the enshrinement of the class-A criminals. This goes in tendon with the apologies, if you agree that Japan acknowledged their crimes and agree they have reflected on their crimes why are there 14 people who committed said atrocities respected and honored? If you go to the wiki page it says the controversies began after the criminals were enshrined and SK has repeatedly supported the removal of just those 14. In addition, LDP, the largest party in Japan that has basically been in power for about 90% of post WW2 has more than a handful of war crime deniers and pro-Imperial Japan members. The reason Germany is brought up so often is because it's literally illegal to deny Germany's war crime (as in they can and will go to Jail) nor can any deniers be elected to government position. Obviously I don't expect things to go that far, and I don't think most Koreans do either. I think most, myself included, is just expecting less war crime denial/revision from Japan(by which I mean less politicians and issues like this one, TLDR. A Japanese newspaper retracted several papers that said a Imperial Japanese officer took forced comfort women).
5. Now I will be the first to admit and other of my moderate Korean friends will agree that there's some changes to be made on Korea's side. There's 2 major problems that need to be addressed. One, as you pointed out, a fair number of Koreans actually don't know any apologies made by Japan, those who do know don't think it was "sincere", this is due to issue number two. Two, in most every apology Japan's issued, there seems to be a certain word that is used. Owabi (here's the link to said controversy). TLDR the controversy is that the word owabi is a "soft/insincere" form of apology according to some Japanese language expert. I asked around in this thread and those who live in Japan agreed that owabi is a "hard/sincere" form of apology. I'm not a Japanese expert, most Koreans aren't Japanese experts so we have to trust what the Japanese language expert said, see how this misunderstanding can come cause a issue?

Look, I like Korea, I like Japan, I like China. I dislike the politics/government in said nations. I genuinely want the 3 nations to get a long better. I don't see it happening any time soon but I sincerely hope so. I will tell you I know Koreans who get along quite well with people from Japan. I will tell you I know Japanese folks who get along swimmingly with Koreans. They hold their own views on the whole Japan-Korea relations and sometimes fight with me/others about it but it doesn't stop us from getting along (as far as I know none of these people are trying to kill each other).

For any Japanese reading this (which I don't know how many since this subreddit is mostly non-Japanese but I've seen a couple), I pray you don't discriminate/hate against all Koreans but I also understand why you may hate some cause trust me, I've seen my fair share of Korean nationalists and they make me sick as well just as much as Japanese/Chinese nationalists