I recommend some BG stories that I like very much in the context of Korean entertainment. The male protagonist is an idol or an actor, and the female protagonist is original.
This article is a must-read for those who love Korean entertainment. The author's forum style is very immersive, and the original heroine is very full-featured. You will fall in love with the heroine's baby after reading it.
Articles about actors, articles about different original female protagonists and different actors and actresses. My favorite among them is the Won Bin chapter, where childhood sweethearts and his wife Chasing the Crematorium are full of buffs, and the heroine has a relationship with Kashiwahara Takashi after they break up.
Written by an actor, the age difference between the two romances is huge, so don't get involved if you mind. The heroine's first love was Gong Liu, and the last hero, Zheng Yusheng, successfully made me get the charm of the old man.
The male protagonist is marked, the female protagonist is original, the writing is average, and the advantage is that there are very few male protagonists of the same style. After reading this article, I successfully got the mark.