Both have similar feels as they're about students, boarding life, rivalry and friendship. Two main leads in both dramas are cute and fluffy. Easy and fun to watch.
This is a sequel to the first drama, second one has korean actor Ji Chang Wook in it too :)
The Royal Gambler is about King Yeongjo's early life and his succession to the throne and The Throne has the events that came later in his life.
The Korean version of the manga 'Itazura na kiss' that came out in 2010