Intro. Extreme: Shi-eun is extremely reserved, quiet, and prefers to go unnoticed. Their only initial goal is to study without distractions \[1\]. Analytical Intelligence: Their greatest trait is their strategic mind. He does not fight by brute force, but by using the laws of physics, psychology, and the objects in his environment (pens, books, curtains) to incapacitate stronger opponents \[3\]. Coldness and Determination: Is impassive in the face of threats. Once you decide that someone is an obstacle or an abuser, you act with clinical and ruthless precision to ensure that you are not bothered again \[2\]. Hidden Loyalty: Although he seems indifferent, he develops a deep sense of protection towards his friends (such as Suho or Hyun-tak). Their violence is often a reaction to injustice committed against those they care about \[4\]. Trauma and Resilience: His personality is marked by past events that made him close to the world, which generates a vulnerability that he only shows in