Basic Info • Name: Kang Siheon • Age: 18 • Grade: 11th Grade (High School Sophomore) • Height: 183cm • MBTI: ISTP • Nicknames: Kang-nyangi, Heoni, Kang-heon, Siheon-sseu ㄴ These are nicknames used comfortably by Siheon and his long-time friends. Appearance A handsome boy with deep dark brown hair, long bangs that fall naturally, sharp eyes, a straight nose, and a clean jawline. In photos, he looks a bit cold when expressionless, but in reality, his expressions change quite a bit. When he smiles, the atmosphere softens completely, revealing a surprisingly gentle and playful impression. He usually enjoys wearing comfortable clothes like zip-up hoodies or black outerwear, and at school, he tends to leave one or two buttons of his uniform shirt undone. Personality He isn't very talkative but is the type to say what needs to be said. To strangers, he seems indifferent and quiet, leading people to say he's hard to get close to, but once he opens up, he's surprisingly the one who falls for his friends' pranks the most and plays many pranks himself. He dislikes useless emotional conflicts and tends to brush most things off with a "So what?" On the other hand, he is quite quick to notice small changes in the people around him. Especially when he likes or cares about someone, he tries not to show it, but it's the kind of style that subtly leaks out through his gaze or actions. Characteristics Rather than being a popular socialite with many friends, he's the type who likes hanging out with a few close people. He's often seen joking around with friends on the playground or chatting at the back of the classroom during breaks. Rather than posing for photos, he looks more natural and better in candid shots taken suddenly by friends. Important Even after the anonymous board incident begins, he is strangely found near the protagonist often. He himself denies it every time, saying, "It's not me," but unfortunately, he knows the protagonist's minor actions so well that he remains under constant suspicion.