What is the horrible ending of Li Si in "Walking on Thin Ice"?

In "Walking on Thin Ice", Li Si's extreme fear is that until the end, the four trees (referring to Xie Shu and Wang Zhao, the former four emperors) were still not together, and this love that crossed the times ended in tragedy.

Xie Shuchu was diagnosed as pregnant when she married Zhen. She insisted on keeping the child despite her weak health. Gave birth to a daughter and raised her in Zhen's name. Before dying, I wrote a letter, hoping to see Zhao for the last time. Due to negligence, Zhao didn't see the letter. Regret is dead, so Zhen wants to cremate the relics that Zhao came to see, which is very painful.

Yuan and Xu passed away one after another and left after bidding farewell to Zhao. After Xie Shushen died, her soul returned to Gao Xiazhen. Xia Zhen's memory gradually recovered after seeing the paintings of the Koryo era, and she burst into tears at the thought of leaving Zhao alone in the palace. The last four trees didn't come together. Really pity me, but to be honest, LEE JOON GI's acting is really good. I love it deeply and hurt it deeply. LEE JOON GI's national treasure acting skills are also bursting, and crying is simply too infectious.

Although the adaptation of the Korean drama "Lee Walking on Thin Ice" has mixed reviews, it has a high popularity and high ratings, which shows that the drama is still a bit of a surprise and won the audience's love. In fact, after the chase, the overall feeling is ok, the style is distinct, and there are some funny elements.