Aqua Planet 63

Aqua Planet 63 is a small aquarium in the basement of the 63 Building in Yeouido, with seals, penguins and rays. A mermaid underwater show with a story runs every hour at 30 minutes past, and there are ray feedings and an otter presentation. Booking tickets online in advance costs less than buying them on site, and seats for the show are first-come, so you have to take a place before it starts. The exhibition space and the show venue are small, so movement through the passages is difficult when crowds gather.