Both dramas are about a contract marriage between starngers - or almost strangers - which turns into real love. In both dramas too, the male lead is a more serious person, and the female lead is a more clumsy person, so they have to set rules about living together.
Both MLs are widower,
Both MLs have 3 kids to take care of,
Both FLs come from poor family
Both FLs help ML in raising/ tutoring MLs kids
Both MLs have 3 kids to take care of,
Both FLs come from poor family
Both FLs help ML in raising/ tutoring MLs kids
Both series involve a young, naive, and silly girl forced into a marriage with a serious, cold guy. She then has to learn to behave in a certain way as she is thrust into the public spotlight. In Goong, the guy is the crown prince while in Prime Minister and I he is the Prime Minister.
Both involve a young woman which's life suddently turns in such a dirrection that she has to take care of few children, which aren't her own. She has to lie about her life and live into a rich man's house. In those dramas the male leads are somewhat agressive towards the female lead as they suspect her honestly loving them (which was the case at the begging).