Long ago in the 1800's, there were empires in Korea. The empires were Kims, Parks, Jeons, Yangs, Gwans & the Lees. The rest of the empires were in peace with each other, but the Kims and the Parks were not. They fought war for justice, and ended up forming an alliance because of the low number of soldiers. So they formed an alliance with a contract. They despised each other so much that no one from both families wanted to marry each other.
"Here be thy contract of our alliance!" The Lord of Kim's raised a paper up in the air and then slammed it onto the wooden table, "Please take a look at it."
"Of course, Lord Kim," The servant said, "It reads that the 187th descendant of each family must marry each other."
"What is this, Mr. Kim?" said the angered Lord of Parks, "So it seems you do not take this alliance seriously!"
"What do you mean, Mr. Park?" The Lady of Kims asked in a polite manner, "I do not see anything "not serious" in this contract?"
"So do I!" Princess Kim cried out, "No one in our family wants to marry anyone in yours, and I am assuming your family thinks the same."
"She is right, Father." said The 3rd Prince of Parks, "This is good enough."
"Quiet, Young Chul, this is a discussion between adults, and you aren't one yet." said The Lady of Parks as she scolded her youngest.
"I suppose so." The 3rd prince obeyed and bowed, "My deepest apologies."
"So it is decided." The Lord of Parks sighed deeply, "I will now sign it. Hand it over, servant."
"As per your wish, My Lord." said the servant who handed in the contract.
The Lord of Parks had a feeling this would not turn out well, but signed the contract in hopes of cooperation.
"Thank you for your cooperation." said the Kims as they bowed.
"Same to you." The Parks bowed back.
And that is how the contract was made.