Hot-blooded and fiery, Han Tae Eun is well known in her school as a formidable fighter, more inclined to her fists than talking things through. She yells often, especially at Sa Kang-Gwon when he aggravates her. As a child her mother was killed by a Trouble in a park, and Tae Eun repeatedly visited the same spot her mother died, until she found a barely-conscious Sa Kang Gwon lying there. She took him home and adopted him as her possession. At some point in time, she discovered he was a Trace and labored to protect his identity, unbeknownst to him.