So there is a state Korea
Which have some kingdoms in it.
There is a KING and Queen of whole Korea who assigned the new king every 30 years on kingdoms separately
Strongest of the kingdom is Seoul
1- king : Kim taeji
Queen : Kim tiwoon(male)
Sons :
Kim beakyung (middle )
Kim Namjoon(eldest)
Kim Taehyung ( youngest )
Kim Namjoon and Kim Taehyung are step sons of Kim tiwoon there actual mother was killed by some unknown reason in there childhood since then they call Kim tiwoon there mother.Although he talk nicely to them but they know he is fake to them and always gives priority to his real son.
( well you see mpreg FF) Kim taeji will be leaving his place as a king and that place would be given to one of his son.As suggested by Kim and Queen of this state.Kim tiwoon wants his son to become king but Kim Namjoon and Kim Taehyung know the consequences that's why they are trying to get the favour of king and queen so that one of them can become king in future
Kim Namjoon was married to Jin but he disappeared suddenly after two month of marriage he was also a prince even his own kingdom don't know where he went.Kim Namjoon never went out in search of his husband because his so called step mother told him it is against rules.
Kim tiwoon has a rule book of his own rules that he made everyone in castle to follow.
Kim beakyung is playboy he always sleeping with random people and getting drunk very often.