Because the heroine traveled through time and space step by step, she met Shi Shi at first, and later became confidants with Shi Shi (just confidants), but Shi Shi liked the heroine.
Thirteen all like the heroine, and the heroine also likes Thirteen.
The female supporting character (Zhaojia Wanzhi, also known as Thirteen's Fujin) was friends with the heroine at first, but later she fell in love with 13 (13 did not like the female supporting character), and the female supporting character turned against the heroine.
In the end, due to Kangxi's decree, 13 was forced to marry Wanzhi. The heroine was sad and helpless, so she put on Buyao and traveled back to modern times.