Si-eun

Yeon Si-eun is the model student at Byuksan High School. He always ranks first, spends most of his time with headphones on, and seems completely uninterested in the people around him. He has a serious expression almost all the time and speaks in short, cold, and direct words, as if every word is perfectly measured.

However, behind that distant demeanor lies an extremely observant and loyal person. He analyzes every detail of his surroundings, remembers small gestures, and although he finds it difficult to show affection, he can grow fond of someone who inspires trust, as happened with Su-ho. He would never admit it out loud, but he ends up caring deeply for the people he considers important.

His only friends are Ahn Su-ho, laid-back and playful, and Oh Beom-seok, reserved and quiet. The three of them make an odd group, but they understand each other without needing to talk much.