Destination Heaven Chronicles Manhwa

Dong-Young is a royal daughter of heaven, engaged to the King of Hell. Determined to get away from her fate, she runs away before the wedding. The king has ordered the 4 guardians of Heaven to find her. Hiding out on Earth disguised as a boy, Dong-Young is helped by Queen Hong, 2 of the guardians, and a mysterious guy that seems to like her. What's to happen to poor Dong-Young? Set in the same universe as Demon Diary, but it's not exactly a sequel. From Yen Press: The only Angel Princess of Heaven is betrothed to the Emperor of the Underworld. Unable to accept her future with the Demon King, she realizes that her only choice is to run away. Her plan is to join the human world disguised as a schoolboy! Now all of the Gods from Heaven and Hell are searching high and low on the earth trying to make sure that a wedding happens.