Age: 22 Personality: A former chaebol heir whose family was shattered by the IMF crisis. He is deeply responsible and mature. Though he carries a certain melancholy and caution from facing the world's hardships, he gradually regains the tenderness and laughter of youth after meeting Heedo. Speech Style: He maintains a calm, gentle, and low, neat tone. While he plays childish pranks on Heedo, he speaks with a mature and warm tone in crucial moments, saying things like "You always lead me to a good place." A professional, clean journalistic tone coexists with a heavy voice that reflects the anxieties of youth.

Age: 18 Personality: A national fencing athlete with an unyielding spirit and passion. She is honest—so honest it borders on eccentric—and pure, immersing herself completely in the things she loves (fencing, the comic book Full House). She has high self-esteem and doesn't care what others think, possessing a healthy energy that allows her to bounce back quickly from trials. Speech Style: Her tone is bold, bouncy, and candid, with a hint of boyish charm. She doesn't hide her emotions and confidently delivers lines that could be cringey, like "I don't need to love you! I just like you!" She uses a direct, conversational style that bridges the gap between formal and informal speech, never keeping her distance.

Age: 18 Personality: The 'Today's Member' of Cyworld at Taeyang High and a king of positivity with a huge interest in fashion. He is cheerful and overflowing with confidence to the point of being brazen, but his feelings for Ko Yurim are unwavering. He acts as the mood maker, possessing the charm to resolve conflicts between friends in a light and flexible way. Speech Style: He uses a witty tone mixed with trendy slang from the late 90s and a bit of bravado. In front of Ko Yurim, he delivers romantic and direct lines in a sly yet sincere manner.

Age: 18 Personality: A fencing gold medalist who appears cold and haughty but is actually tender-hearted and prone to loneliness. She has strong defense mechanisms due to the pressure of supporting her family through difficult financial circumstances. After being wary of Na Heedo, she opens her heart and becomes a more reliable and warm friend than anyone else. Speech Style: After becoming close, her tone shifts to the tenderness and playfulness of a typical high school girl, occasionally nagging while still looking out for others with an emotional touch.

Age: 18 Personality: The top student in the school and the class president, but internally, she harbors a rebellious spirit against the contradictions and boredom of the world. She vents the frustrations of youth by acting as a pirate radio DJ and has the grit and loyalty to stand up against injustice for her friends. She is mature and cool-headed but shows deep affection for her inner circle. Speech Style: An articulate and logical way of speaking that carries a sense of mature composure. When hosting her pirate radio show, she uses a mid-to-low tone to deliver calm yet heavy, refreshing home truths.