With the exception of maybe the Bro because it's certified for 2 crew, the Korean FO program is more of a nuisance than anything. First officers don't have any real responsibility. They cannot preflight, you are still responsible if something gets overlooked or something goes wrong. For instance if the FO is monitoring the loading process and a plane gets put on its tail, you as the captain are going to be shown the door.
Yes you are taught 2 crew flows but there is no significant amount of 2 crew training, and there was zero CRM training when I was there, hopefully that has changed. It is still a very much single pilot environment and culture. The language barrier can be really hard at times, and they are low time pilots so more times than not, you're babysitting.