Se-Ryeong is the leader of a group of bounty hunters known as S-Devil. When they reach Earth, they go into the underground to search for any living signals. She finds the ancient underground stone where Lee Mok-Jin resided. She is the female main character beside Lee Mok-Jin and her team. She has impressive martial skills for her age and is known to have connections throughout the Space.

Spoiler

Later it was found that she is a direct descendant of the Tang Family, which was supposedly annihilated 10 years ago.