"I have some private business to discuss with the king..." Zen would look the guy up and down "You are his brother?" Zen asks remembering a conversation about this very man when he was talking to pain a long time ago. He would look weirdly at the fact that the kings brother looked non-threatening at all and that he just seemed like an innocent kid.
"Im more surprised about how you are still alive." Zen says as he decides to chat with Ryun while he waits for the king to finish, "The king told me you were dead when we met a while back."
"I...I don't know, i remember fighting some guy aswell... Then i woke up and couldn't remember what i was doing. But all i could remember was an important message i had to tell your brother." Zen says with a frown as he tries to remember his past but then snaps out of it as his usual impatient glare would re-appear on his face. "Anyways thats enough about me... You said you died fighting a shinigami yet your still here. Im not the sharpest knife in the cupboard but even i know that dead people can't walk or talk, are you immortal or something? And i thought Shinigami's don't fight eachother." Zen says as he waits for the man to explain himself.
"I see... So what is this oh-so important conversation that pain is having that i am not allowed to interrupt." Zan says as a he would let out a malevolent smile meaning that he felt like killing someone or something. "Because i don't care who i have to take on, i will storm in there myself if i have to." Zen says, "Ill make this interesting, i will give you all five seconds to let me in before i barge in myself." Zen says as he cracks his knuckles and gets ready to attack.
Seeing this, Zen would quickly send a blast of his own aura towards the incoming attack which would hit the attack but only to slow it down as Zen used the time that it took for Ryuns attack to cancel out his own and safely moved out of the way from the attack. Zen would then leap off the ground and fly into the sky, "Hmph, your strong but i have sparred with your brother before and compared to him you are nothing." Zen says as he sends a wave of his own aura towards Ryun, which will send him flying and give deep cuts to his chest when it makes contact.
Zen would instantly start to focus on sensing Ryun's aura now as he prepares to defend against any incoming attack. He would then start moving around to avoid any surprise attacks.