You might like 'The Duchess of the North'. It shares some elements with 'Madam' in terms of the story and the female lead's character development. Also, the art style is somewhat comparable.
In many cases, it is legal to read manhwa online if it's from authorized and legitimate platforms. But reading from unauthorized or pirated sources is illegal.
Another must-read manhwa in 2020 was 'The God of High School'. It combined exciting battles with a compelling narrative. The diverse characters and their growth throughout the story made it a standout.
Madam Ronghua and Madam Xuanhua were two palace maids during the Sui Dynasty. Madam Ronghua was the concubine of Emperor Wen of Sui, Yang Jian. She was favored after the death of Empress Dugu and was named Madam Ronghua. Madam Xuanhua was originally the younger sister of Emperor Chen Xuan of the Southern and Northern Dynasties. She was later captured and assigned to the Ye Court as a palace maid. Later, she was chosen as the concubine of Emperor Wen of the Sui Dynasty. There were no detailed records of their relationship and subsequent developments in the literature.
Well, 'Lookism' is a top manhwa novel. It deals with themes like appearance and self - identity in a really interesting way. 'Sweet Home' is also highly regarded. It combines horror and survival elements in a post - apocalyptic setting. And 'Noblesse' is a classic. It has a great story about a powerful vampire awakening in modern times.