He is horrible at strengthening tests. He placed 15th in the Shinsoo Strengthening Competition. Also, interesting to note, he's worse than Nia when it comes to Shinsoo strengthening.
His name read backwards, actually means (Nan-"I am") (Wangja-"prince").
Officially, the Zahard Family has no Prince and Wangnan's exact relation to Zahard is unknown, yet many fans speculate that Wangnan is the "Prince of Zahard". But, according to Hwa Ryun, he is apparently Zahard and the 10 Great Families' biggest "mistake".This was further confirmed by Rachel, who said that "they were the fatal weak point that Zahard tried to hide but ultimately survived" that they "gained power that they weren't supposed to have".
Hwa Ryun refers to Ja Wangnan as "the Prince of the Red Light District" or "the Prince of Red Light Family" (홍등가의 왕자, Hongdeunga-eui Wangja). However, it is unknown what Hwa Ryun meant exactly. At the moment, both translation are unconfirmed until SIU reveals which one he meant. (Note that Red Light District is an existing Korean word, so the former has a higher chance of being right.) In a dream he had, Nya Nia used the same words to name him.
As shops in red light districts have girls on display, the former could be an insult against Zahard's Family, as people often figuratively say that Zahard puts his Princesses on display.
The former could also literally mean that Wangnan is an illegitimate son of Zahard.
The latter could mean he is a child from a family that has not yet been shown.
Karaka wears the same ring as Wangnan. Though they are currently in the same party, and only Wangnan has noticed Karaka's ring thus far.
SIU stated that he is knowledgeable about many of the Tower's secrets.
He added that Wangnan's climb of the Tower is one of the main axis of the story.
He has chosen Yellow Prince (노란왕자, Nolan-Wangja) as a code word to be contacted through Emile.
Wangnang was not raised by his parents. Instead, a nanny raised him and called him the "seed of the king".
(To Nya Nia) "I believe the difference between those up there and me is the question of whether you have given up or not."
(Pleading to Jyu Viole Grace) "Pick me please! If you just pick me, I'll do anything! If you tell me to bark like a dog, I'll bark! If you tell me to lick, I'll lick! Just pick me!"
(To Nya Nia before his death) "It's alright, you crybaby. If I fail, I can just retake the test. What do you take me for? The fact that you have something to protect... you're already a great man, Nia. Even without climbing the Tower, I think you found your true self, here. You've now graduated from being my mentee. Congratulations, Nia. You're such a kind boy, really."
(To Jyu Viole Grace for the connector) "The one who beats down the bad guy is not a good guy, but an even worse guy. You… aren’t you the worst guy in this Tower? So why don’t you go punish that pathetically evil guy with me."
(To Kim Lurker) "Even if everyone laughs at me and tells me it’s impossible! Even if I fail the tests thousands of times! Even if I’m betrayed and forgotten! I will never give up!"
(To Jyu Viole Grace) "Because... I, too, want to be forgiven... In order to climb the Tower... Ignoring people on the verge of death, tricking people, killing people... I realised him and I wasn't that different after all. From now on... I couldn't imagine how many more people I might be killing after him... So... That's why..."
(To Jyu Viole Grace) "If I was your friend, I don't think I'll regret it even if I were to die for you. Friend."
(Explaining about the wrong move made by false believers to Chang Blarode) "Those guys... messed with the wrong guy. Viole doesn't enjoy fighting, but if he thinks he see's the need to fight, he becomes frightening."
(To Beniamino Cassano) "I have never seen a decent person among those who say they are going to save the world while forsaking the people around them. Those type of men are always so intoxicated by their own hollow dreams that they call every little thing in front of them trivial. You think I'am an unworthy vessel? Why don't you take a look around you? Do you see anyone at all who genuinely believes what you are saying? You are just a chess piece that they like to use."
(To Akraptor) "Akraptor.. I'm actually an extremely remarkable person. Although I can't tell you right now.. I'll definitely tell you someday. What kind of person I am.." (#306 - S2 - Eps.226)
(To Rachel) "And just don't forget this one thing as we are climbing the tower together. Someday, without a doubt.. I will make you pay the price for killing Arkraptor!!."
(To Rachel) "Don't get me wrong. I was insulting you, not complimenting you. All I wanted to know is why a nice kid like Viole would be following you around."
(To Karaka) "I don't know what qualifications a Prince needs to have!! But I would rather become a real Prince!! And stand firmly before that bastard Zahard, the cause all of this!! And I'm going to make sure I tell the king about her!! So tell me!! What happened in the Red-light district?! Why do we both share part of this 'Key'?! You know something, don't you?"