What is a lighthearted Drama that remains like this till the end?

So I've been watching a lot of shows and they always start great with funny lighthearted story then the curse of ep 7 hits then they out of nowhere it starts adding all the annoying "for plot" drama then suddenly you're not watching a comedy series but a melodramatic one lol.. 

so my question is: do you have any recommendations of dramas where it maintained being lighthearted till the end?