Oh yes how I love my C-dramas.. here are some favs..
Historical: ( I made sure that the ones I recommend aren't too heavy so it's on the lighter/easier watch side, and if there is a love triangle, it's slight and doesn't heavily affect the main couple)
Modern: (again, all are happy ending, with no love triangle. There might be slight interest in other characters, but definitely not strong enough in my opinion to count as a love triangle..)