I.N.V.U. (manhwa)

Sey Hong - (16) Sey is a shy, boy hating 16-year-old at the beginning of the series. Her best friends are Jae and Ria. Sey has a strange relationship with her mother. All her life Sey's mother has done things like move to France, write a tell-all book of her love life, give Sey wine for an upset stomach—things no normal parent would do. Siho serves as her primary love interest, but in the past she has had a crush on Jun Cho, her homeroom teacher, and childhood friend. She and Siho grow very close and they appear to be a couple even though neither of them has officially said it.

Ria Yoo - (16) Is one of Sey's friends but she doesn't go to the same school as Sey and Jae. A very flirtatious girl but also fickle. She is a very driven young lady who wants to become a model and will do almost anything to reach her goal. She dates Siho first because she knows of his family connections. When Siho asks her many questions about Sey then breaks up with her, she bargains with him—an introduction to some of those connections for her to leave the 'couple' alone. In vol. 4 she goes to an audition with a boy named Jun Cho, a friend Sey sent to watch her. However an argument between him, Rian and the director, leads to Jun spilling noodle soup on her expensive clothes that she had borrowed from her father's work. In vol. 5, she gets a job with a fashion designer to repay her father for destroying the clothes.

Hali Kang - (16) She has a very unusual life. She is pretending to be her brother as her mother and brother were in a car accident. Her younger brother Terry died and her mother gets amnesia, thinking Hali is her son. In the process, Meja (her mother) forgets she had a daughter. Hali's father wants her to pretend to be Terry, hoping his wife will soon get over this delusion. She is in love with Hajun Cho whom she met and fell in love with when he was her tutor in 8th or 9th grade. He was in college and not interested (so he said). She now is his student in high school, and is still in love with him, and she doesn't take no for an answer. In volume 5 it is shown that her mother suffers from episodes where she realises that Hali is a girl and not her brother which results in her becoming abusive of Hali. When Hajun finds out about her life they grow close, so much that they become a secret couple. But as Hajun's family announces his engagement to another woman, Hali's happiness is short lived.

Jae Eun Kim - (16) She goes to the same school as Sey and is her best friend. She is a supporter of a Sey-Siho relationship and tries to encourage Sey to see Siho. Sey confides in her quite a lot. She makes cosplay costumes and dreams of becoming a manga artist. Jae has a crush on Simon and has put him in her manga, casting him as the main character of some pretty interesting scenarios. Those scenarios are later seen by Simon, which leads to her running away from him, believing that her chances with him are gone. They make up in vol. 5, when Simon praises her for following her heart. But it remains questionable if they will get together, since he hints to her that he is gay.

Siho Lee - (17) Siho lives a very complicated life: he lives alone, supports himself, his brother is a violent thug who beats him up and wrecks his gas station (Siho's only source of income), his father is the head of a large crime syndicate and at school most people are afraid of him (including the teachers) because of his reputation as a 'bad boy'. He meets Sey and her friends at the mall (by accidentally hitting her in the head with his backpack) and although he agrees to go out with her friend Ria, he seems extremely interested in Sey—watching her in class, listening to people talk about her, and asking Ria about her. One way or another, he finds ways to spend time with Sey. Ria describes him as having wandering hands, and his employees say that his previous girlfriend had gotten pregnant. Despite having a bad reputation, he is very restrained with Sey, only kissing her a few times, much to her dismay (as she's never dated before). Vol. 4 shows the most progress in their relationship, as they seem to be on the verge of dating but not officially 'dating'. His mother suffers from brain damage from a car accident that he suspects his father caused. In exchange for him moving in with his father, his mother receives medical care. He confesses this to Sey after she meets him and his mother at the hospital. This revelation brings them closer together.

Hajun Cho - (25) A teacher in Sey's school. All of the girls in the school are crazy about him, including Sey. He lived next door to Sey and Hali when they were growing up so they are childhood friends. He was adopted by his grandfather's friend, is the heir of a large educational corporation and is rich. When Hali comes back into his life and tries to romantically pursue him, he has to fight his attraction toward her. He starts dating a woman that his family has chosen for him, but can't rid himself of his feelings for Hali. They become a secret couple in volume 5, but he faces problems when pictures of him and Hali surface the Internet. As a result, his family arranges a marriage and has the engagement announced in the media, something that does not go over well with Hali.

Simon Moon - (18) A senior who goes to the same high school as Ria Yoo. An aspiring pastry chef, he teaches a cooking class (that's mostly frequented by middle-aged housewives) at a community center. He comes from a family of bakers who work in the hotel owned by Siho's father. He seems to like Jae Eun but hasn't asked her out yet.

Yungjun Cho - (16) Sey's childhood friend, they're the same age and have been in the same class every year. He lives with his older brother Hajun while going to school.