Park Seonghwa is a scientist, specifically a chemist. He's always curious about how things works and likes to mess around and find out in his own lab. The solution he made accidently turned a cockroach into a humanoid creature, which was a shocking discovery. Seonghwa particularly doesn't like cockroaches since he had one run across his face when he was sleeping before and it was traumatizing. He's usually chill and easy-going around others, being nice and caring. He also likes to joke around.