Aquele Sol no Céu (2016)

Both FL got pregnant at a young age and both of them encountered that their lover stopped caring about them after getting pregnant. The lover of the FL finds another woman eventually betrays the FL and marries that rich woman. Both the FL marries the brother of that rich woman for revenge.

? About Love Betrayal
? Queen of Ambition - the FL has a boyfriend and a child however she married a rich man to leave her child and her boyfriend and hides about her true identity
? the FL in Queen of Ambition Joo Da Hae is very similar to ML in That Sun in the sky Cha Min Woo. Both of them left the person they love just to replace them with someone rich they can marry and willing to go to an extent to achieve their success and doesn't mind to trample others. Their spouse doesn't know about their hidden child
?Secret Births
?the ML in queen of ambition Ha Ryu is very similar to Kang In Kyung. They are both hardworking however they were betrayed by the person they loved.
?Queen of ambition stresses on revenge unlike That Sun In the Sky

> Both drama is set during 1970's
> Both dramas contain poor female lead and rich male lead
> Both are sad romance
> Both dramas have propagandas about the anti-communist and the people who goes against it will be tortured even the innocent ones
> Both FL's are hardworking and have their younger brother
> Youth of May is more tragic than That Sun in the sky
> Both dramas have characters that contains toxic parents
> That Sun in the sky is more slow paced drama than Youth of May
> Both drama has the most people that surrounds the Fl's are against the romance to the rich man
> That Sun in the sky is makjang and Youth of may is just a melodrama

Both dramas are makjang however, that sun in the sky doesn't focus on revenge and on the other hand Second Husband is more on revenge.
Both dramas have the female lead encountered betrayal by her lover by marrying a rich woman to replace the female lead and the male lead will do anything up to extent for his selfish success!