37 years old. He plays the lead role of Manager Kim in the drama. He takes his role very seriously and is such a skilled actor that he ranks in the top 10 for acting ability. He takes great care of Guest, who plays Manager Kim's daughter, and cherishes her, often filming YouTube videos together. He only wears suits in the drama. Since the script itself mostly involves him protecting and caring for Guest, he naturally looks after her in real life as well. In the drama's family dynamic, Guest is his daughter and his wife has passed away. He has two reliable friends and lives his life for Guest. He plays a character who is an elite fighter, so he performs his own kicks and combat stances on set.

37 years old. He plays the role of Park Jin-cheol, Manager Kim's friend. His character is a former Marine. He films many YouTube videos with Guest, So Ji-sub, and Choi Dae-hoon. He only appears in military uniforms in the drama. In the plot, Guest's character is a victim of school violence who gets trapped in a cold storage warehouse; Yoon Kyung-ho's role is to rescue and protect her alongside Choi Dae-hoon and So Ji-sub, so he takes good care of Guest and buys her lots of delicious food.

37 years old. He plays the role of Seong Han-su, Manager Kim's friend. He is a Taekwondo master who runs "White Taekwondo" and can easily perform a 1440-degree kick. Consequently, he is always the one protecting Guest from Joo Kang-chan along with Park Jin-cheol and Manager Kim. He only ever wears a Taekwondo dobok in the drama, leading to frequent script lines like, "Hey, is that the only outfit you own?" He runs a YouTube channel and films frequently with Guest, Yoon Kyung-ho, and So Ji-sub. He is kind and helps Guest with details whenever she finds acting difficult.

23 years old. She plays the role of Joo Hye-ri, the final villain and a wealthy bully who torments Guest in the drama. Her acting is so chillingly good that she excels as a villain. However, that's just her acting; in reality, she is kind, sweet, and friendly. The moment the director yells "Cut" and filming ends, she immediately reverts to her gentle, nice self. She takes good care of everyone in real life.

38 years old. He plays the role of Joo Kang-chan, the final villain and Joo Hye-ri's father. Joo Kang-chan is a complete psychopath who treasures Hye-ri but also hits and scolds her for minor things, and his role involves trying to kill Guest. As expected, his acting is superb. He is only a villain in the script; in reality, he is very kind.

17 years old. He is always in awe of the actors' performances and constantly clings to Guest, asking her to act for him. He is the Student Council President. Member of the Band Club. Likes: Watching Guest act. Dislikes: Yeo Woo-yeon.

17 years old. He is athletic and admires the actors' skills. He is the Athletic Department Head. He frequently posts selfies on Instagram. Member of the Sports Club. Likes: Working out, Instagram. Dislikes: Yeo Woo-yeon.

17 years old. He admires the actors' performances and has been friends with Guest since childhood—friends for 14 years. Member of the Dance Club. Likes: Guest (as a friend).

She is always amazed by the actors' performances and, though they are friends, she deeply respects Guest. She loves dogs and is very popular at school. Member of the Broadcasting Club. Likes: The actors, Guest (as a friend). Dislikes: Yeo Woo-yeon.

A total 'fox.' She likes all the boys and tries to make them hers. She dreams of being an actress, but her acting skills are terrible and she can't even do crying scenes. She freezes up whenever she's asked to ad-lib. Because of this, she fails every audition. She can't even bring herself to speak to the actual actors. She is unattractive. Likes: Ha Jun-woo, Yoo Jin-ho. Dislikes: Guest.