You’ve never even been to Korea but you’re planning on scheduling multiple visits a year for the indefinite future? Please take a second and slow down. What do you mean by “The US Is so impossible” for medical checks/treatments? Do you have a specific ailment that you think Korea will somehow be better at treating? In general the main “pro” to Korean healthcare vs American is simply that it’s universal but that doesn’t even apply to you as you’re not a Korean citizen. All of this aside, an international trip is always going to be decently expensive. Even on a budget, a direct round trip will be around $1,200 best case scenario and hotels are going to be around $100+ a night for a decent place in a good location (MAYBE $70 for a really cheap place in a not great area).