it's hard because I love historicals as well but most of them have a sad ending
legend of Yun Xi - happy ending
Story of Yanxi Palace - happy ending if you like the male lead (HIGHLY RECOMMEND)
Sound of the desert - happy ending
Moon embracing the sun - happy depending on which male lead you liked
Story of Ming lan - Highly recommend!! good ending
Sad endings but good dramas
Princess Weiyoung
Empress of China
Queen for Seven days
Empress Ki
Rise of the Phoenixes
Empresses in the palace
Princess Silver
Scarlet Heart (korean version)
Legend of Mi Yue
Chronicle of Life
Queen Dugu
Legend of Dugu