Originally, I wanted to take pictures of the night view of Achasan and the night view of GangbyeonTM Sky Park, but after watching Fantastic 4 and moving around from 3 PM, I ended up passing because I didn't have enough time.
Later, on a day without fine dust, I should take a tripod and do the Achasan sunset, night view, and GangbyeonTM Sky Park night view course.
It was a bit disappointing because it was hot and there was fine dust, but it was still a fun day.