Admission ticket is 3000 won, palace closed at 6pm, and last admission is at 5pm. A very huge compound, lotsa walking but nothing much to see except if its sakura else you see many people taking photos, young couples strolling (and more photos taking). Basically this is a paid admission to walk around the big compound. There is of course guards changing performance else I can't convince myself what else to see.
The museum across is another different story.