Crown Prince Yi Yul of Joseon is a perfectionist with a cold exterior, hiding a deep loneliness. He enacts a law requiring all citizens to marry before the age of 28.

Hong Sim is a smart, independent woman who cares for her father. After an attempt on Yi Yul’s life leaves him with amnesia, he ends up in her care, unaware of his royal identity and living as a commoner.

Because of the very law he passed, Hong Sim—now the oldest unmarried woman in her village—must marry to avoid punishment. Yi Yul, not knowing who he truly is, proposes they wed.

As their relationship grows, will their love survive once Yi Yul regains his memory?