Kidd has lived in the slums since he was a child, but when he was eleven years old, the local gang leader massacred his village, including his parents. Kidd, who lost his mother at a young age, was raised by the warden Wharton. Kidd, who was living under the roof of others at a young age, became a forbearing and silent person. When he was 28 years old, he finally left the place where he was born and raised. He only wanted to find his enemy. Kidd, who successfully left, could only make a living by boxing in order to obtain resources for survival. But the salary from boxing was not enough to support himself. He could only rely on multiple divisions of labor to maintain his life. Inadvertently, Kidd discovered that Kunni, the owner of the King's Club where he worked, had a great relationship with his enemy back then. He wanted to find clues about his enemy through Kunni. Fortunately, he later met Sita who was willing to help him. The two made a careful plan and found the location of the enemy. Kidd, who has already had a lot of life experience, understands that he cannot really avenge his parents and those innocent people by his own strength. So Kidd finally joined forces with the righteous police to eliminate the criminals.