Autumn is the best time to see South Korea. The weather drops into the crisp 60s, Gyeongbokgung Palace is framed by bright red maple leaves, and the night markets in Seoul are packed with hot tteokbokki and fried snacks.
A typical trip runs about $2,800 for flights, hotels, and food. Instead of dropping that cash all at once, you can break it into $186.67 a month over a 15-month window.
Keep in mind that an intro window is a strict deadline, not free money. You need to pay off the entire balance before the 15 months end, or regular interest kicks in on whatever is left.