Historical reccs!!

I just finished an Article on the beauty of historical dramas.. and I am a huge fan of it.. so give me some recs.. bt please help with happy endings only. I can't bear with a sad ending.. also it would be better if it is a historical... 

Period dramas are also acceptable ( loved battle of Changsha)

Thanks in advance

✔ Love in the Moonlight 

✔ Sungkyunkwan Scandal

✔ Princess In Hyun's Man 

✔ Scholar Who Walked the Night