it's so good I can't get it out my head but it has a sad ending

I love this cdrama but the main couple had like 4 marriages and all 4 were tragic but it's worth watching but I especially love the ost and the music it's so good and some side couples had an open ending but some were also bad ending. I cried a river while watching this cdrama but it was also heartwarming and I also laughed a lot but I really am sad bc the male lead didn't know she was pregnant and he died not knowing she was pregnant it would have been the most powerful family if he were alive .