Yooseven

Yooseven is the slash ship between Saeyoung Choi and Yoosung Kim from the Mystic Messenger fandom.

Canon
The two boys are fellow RFA members and close friends. Saeyoung often teases Yoosung and plays pranks on him. Yoosung easily believes what Saeyoung says since he thinks Saeyoung knows a lot. He even admitted it in a chatroom after being fooled by Saeyoung. The two really care about each other and Saeyoung does apologize to Yoosung if things go too far.

Casual Story
Saeyoung talked about how stressed he was and how he wanted to get rid of it. Yoosung joined the chatroom and told Saeyoung to learn to make coffee since he himself was learning to make coffee. Saeyoung said that Yoosung had a rare disease called "Pass Out After Drinking Caffeine Syndrome" and that he was going to pass out soon. Yoosung didn't believe it at first, but believed it after Saeyoung sent a photo of a page for POADCS on Cherrypedia. Saeyoung recommended that Yoosung should drink chocolate milk before fainting to increase his blood pressure and wake up faster.

Later, Saeyoung acted as if Yoosung was about to die then left the chatroom. Yoosung, who didn't notice Saeyoung leaving, started sending paragraphs that he thought would be his last words. Jaehee revealed that Yoosung was tricked and that he did not have a rare disease.

Yoosung's Route
When Saeyoung reveals to the rest of the RFA members of the bomb in MC's apartment Yoosung is quick to request to Saeyoung to help the MC. However, Yoosung loses his vision in one eye which makes Saeyoung feel very guilty.

Bad Relationship Ending 1
Yoosung confesses that he only liked MC because she reminded him of Rika and he goes to Saeyoung's house where Yoosung asks to live with him. Saeyoung declines and the screen goes dark, to Yoosung's confusion. Saeyoung tells Yoosung that they have to make an announcement. Saeyoung announces that the game will end for not having enough likability points and that the player should still play again even if they hate the characters. Because Yoosung remained confused throughout the whole thing, it can be implied that Yoosung doesn't know he's in a game while Saeyoung does.

Fanon
Saeyoosung is widely accepted in its fandom, with its rivals mainly only being their respective ships with MC and Yooran. It can also be shipped along with Zumin and Jaehee x MC or along with Zenhee and JuV. Although, some people tend to view their relationship as brotherly because of how Saeyoung teases Yoosung. There is a photo of Yoosung kissing MC from the left while there is a photo of Saeyoung kissing MC from the right, which makes it very easy for fans to edit the two to be kissing each other. There are 322+ works on AO3.

Fandom
FAN FICTION

TUMBLR

Trivia

 * The ship name Hacked Gaming refers to Saeyoung being a hacker and Yoosung gaming a lot.
 * Saeyoung was the one to put the star (★) in Yoosung's RFA Messenger username.