Angel Diary (Korean: 천행기; Hanja: 天行記; "Destination Heaven Chronicles") is a manhwa written by Lee Yoon-hee and drawn by Kara.
The Princess of Heaven, Chun-yoo, runs away from her betrothed fiancé, the King of Hell, and finds refuge on Earth disguised as a high school boy, Dong-young.
She does not wish to be married to the King of Hell, to whom she is betrothed, assuming he is some kind of perverted old man.
Later in the manga it is revealed that the royal children of heaven are genderless until a certain age, that then can the child can choose its gender.
He trained with the Ice Snow Sword up until a certain age, when it was declared he would become a she for the Peace treaty between Heaven and Hell to work.
Dong-young's main goal was to have a lazy life just like her brothers, who had all grown up and moved away, sitting lazily around in palaces and slowly inheriting money.
She shows traits of being strong-willed and very determined, as she was ready to fight Doh-hyun as he attempted to take her back to Heaven.
During the rescue of Dong-Young's kidnapping, he tells his brother that he stayed with her because he knew that Ryung-Jin would some time approach the Princess, and it would make it easier for him to find Ryung.
Once Ryung agrees to make peace, Bi-Wal returns to his post as King of Hell.
One of the Four Guardians of Heaven, the "White Tiger", and was mistaken as Ee-jung by Woo-hyun, who had bullied her when they were little because of his crush on her.
As she became more attractive, Ah-hin discovered at a young age how to tell disingenuous personalities from true characters.
Because he is the Red Phoenix, it is traditional that he wore female clothing as a child and as a result, he was mistaken as Ah-hin by Woo-hyun.
Noted to have a "sister complex" by Dong-young, Ee-jung dislikes if others treat her any less than what he sees fit, especially towards Woo-hyun.
Even after a few years, Woo-hyun still likes Ah-hin and tries to make it up to her even with her bitter rejections and Ee-jung's cold warnings.
Probably one of the most energetic of the group next to Dong-young, but at times can be seen as serious, such as when he threatened to fight the Princess in order to return her to Heaven.
At times can be perceived as naive or even lazy, but Woo-hyun cares deeply for his friends, especially towards his cousin Doh-hyun.
Despite his observing nature, Doh-hyun finds out that Dong-young is a girl but still does not make the connection that she is, in fact, the Princess of Heaven that he was ordered to capture.
In later volumes of the manga, it was found out that since they were still little kids, Doh-hyun has liked the princess and wanted to protect her.
She doesn't like the idea of the Princess of Heaven marrying the King of Hell because she was in love with Bi-Wal "first" and wanted to end the engagement.
Although both are show to be happy together in the final chapters, they morn the wedding of Bi-Wal and Doung-Young, saying they feel sad over their former crushes.
A water nymph appearing in volumes one and two that lives in the pond near Dong-Young's school vacation spot.
Happy, he stayed with her for some days, bringing her a hair clip and talking to her, thinking them friends.
However, upon finding his love interest kidnapped, Bi-Wal enters the underwater lair to rescue Dong-Young.
She was behind Doung Young's escapade to earth and ordering White tiger and Red Phoenix to guard her.
She is the eldest child of the royal family of Hell, and Ryung-Jin and Bi-Wal are her twin brothers, younger by 100 years.
It is discovered that one demon is born with immense power each generation and eventually kills the current leader.
Dong-Young seeing Ryung's true feelings realizes that he needs Se-In and regenerates him in a seed because he was given her blood she is able to.