Zen (real name Hyun Ryu) is one of the main characters available through the Casual Story in Mystic Messenger. Zen is a semi-successful actor/dancer/singer. He can come across as narcissistic about his looks, often posting selfies and exclaiming how handsome he is. However, while it may seem he cares about his appearance the most, he wants to be recognized and appreciated first and foremost for his career skills.  On the surface, Zen is known for being a very eccentric and flirtatious character. He will often talk about his looks, praising and complimenting himself for how attractive he his, as well as how talented he is when it comes to singing and acting. Zen tends to compare others to himself when it comes to looks, frequently telling Yoosung to work out to look half as good as he does. Despite this, Zen can become very loyal and caring, especially to those he cares about. In all routes he cares deeply for MC. While Zen likes to compliment himself, he often flirts with the Main Character. He usually calls them "sweetie" or "babe".

In conjunction, deep down Zen self doubts himself, wondering if people only see him for his looks, rather than his talents. He can be easily upset if something affects his career, almost entering a depressive state.

He is known for pursuing larger and better musicals, offering up smaller ones or turning them down if the opportunity presents itself.

Like many of the members, he has scars from his past which can't be forgotten. Zen is a tall young man with noticeable muscle tone due to regular training. He is 182 cm (5' 11") tall and his weight is 75 kg (165.3 pounds). He has silver-white long hair with short bangs falling slightly over his eyes, and his hair is tied in a low ponytail which reaches down his back. Zen's eyes are a pinkish-red and almond shaped.

He is shown wearing multiple outfits, including a grey jacket with large buttons and a logo feature, a black turtleneck, tight fitting pants and black formal shoes. Zen is the youngest son in his family, and lived with his mother, father and older brother. His family is described as being quite conservative; his parents being teachers and his older brother working as a lawyer. During his younger years, he was harassed by strangers as they followed him to touch him or take pictures of him.

He would often be treated poorly by his parents, specifically his mother, who questioned who he got his looks from and frequently called him ugly, causing a rift to form between the two. Zen would often confide in his older brother, who would explain that his mother was only saying those things to 'protect him' from being used by others due to his handsome appearance. She also wanted him to think that he wasn't handsome, she feared he would follow the steps of her nephew and other handsome men in becoming unscrupulous and damaging the family name. As he entered middle school, Zen gained a boost in confidence due to his looks, and he began finding his passion for acting and music, to which his mother strongly disagreed with, believing that he should become a doctor or lawyer like his brother.

During these years, he found out that his older brother had started siding with their mother for him to drop his silly hobby and diligently study to become successful like him. Due to this, Zen dropped out of school and ran away from home, renting an apartment, barely surviving with the rent while working small jobs here and there. He also admitted that he even did 'bad things' to survive, including threatening people for money.

After finishing work, he meets Rika, who has a bouquet of roses, and she praises him for his talents and states she's been watching him ever since his first musical appearance. Rika then persuades him to meet V and to get a photograph together, as well as telling him she knows someone who can help him become successful. He meets Jumin Han and instantly dislikes him, denying his offers. Later, Zen eventually joins the RFA.

Feel free to do your own take for his voice. However, if you absolutely have no idea what to do here is his Korean voice clip: https://youtu.be/-XR0nnqynKc