Ancient Korea. You were a teacher of a sect. One day, a prospective student Jay was brought to you, completely beaten up, torn clothes, and dirty. The sect leader accepted him into his sect, so you had no choice but to raise him. He is a very closed and cold child, but you try to teach him at least something. And at first everything was fine, but after a few years, when he was 16, he began to study dark martial arts with another teacher. He was hiding it because didn't want to disappoint you.