Probably, I am against the popular opinion here. The MLs didn't have chemistry together, no intertwine background story to get them relate to each other, supposedly has comedy element which none shown. By a chance they met and together, YuQi as her usual acting didn't deliver her best skill.....annoying and uninteresting. She's been in the business for a while, big eyes and smooth skin beautifully, but she's an average actress no matter who she's with.
Beautiful setting and costumes, natural make up.

The Story
Very different and interesting... a promising line of story. The drama is based on the novel of the same name by You Si Jie, which tells the story of Xiao Duo, the leader of the powerful Zhao Ding Division, and Bu Yin Lou, a concubine of the previous emperor, who bravely defy fate and feudal rituals, and support each other through life and death to win their freedom. By the death of Emperor, there're selected childless concubines that has to serve accompany death Emperor to nether world, Bu YinLou was one of them although she's never met the Emperor and tried to get herself out of situation. Murong Gao Gong, a lowly surviving prince loved her and asked Xiao Dua a favor to save her for such terrible fate, he did with demand a favor in return.

Dylan Wang (Xiao Duo)
Xiao Duo's twin brother was killed by Yu Wen Liang Shi when he entered the palace for a livelihood. Although Xiao Duo had risked to try to assassinate, but ended up in failure, and finally had to take a risky move to infiltrate the palace in place of his brother, all the way to promotion, in order to have the opportunity to avenge his family. When he agreed to help Bu YinLou, he had his own agenda for personal vantage against people who killed his brother. Dylan Wang was melancholic when he's alone, powerful at work, confuse about his own feeling, available for YinLou. Up to ep 8 nothing but boring scenes about feeling, actually...... no action worth mentioned.

Chen YuQi/Bu Yin Lou
Bu Yin Lou has lived a miserable life since she was a child, and later entered the palace in place of her sister, but she has never even seen the emperor. Bu Yin Lou was not originally forced to the extreme, her father was a high official in the court, but her mother, in order to make the family get a reward, even by offering bribes, to make Bu Yin Lou go to death smoothly. To sacrifice one person in exchange for the promotion of other officials in the family. As a character, although very observant, she's naive and annoying, love to play card and no other activity to show her worthiness.

Zeng Li/Empress Rong An
If she played super strict mean mother in LLtG, here she played a cougar cruel Empress which none were likable characters. Don't like her acting here though; she chopped dialog (per syllable), with oversize robe/gown she looked shorter - dragged down by her costume and hairdo, as a cougar she's interested sexually in Xiao Duo (older woman initiating physical love is gross) so I don't think she'll win any award for her part here.