Hong sisters are known to take inspiration from fairy tales and add it into their works. In Alchemy Of Souls, the sisters added elements from Snow White such as a mirror.
Korean language loaned a lot of Chinese words. Here many places names have Chinese origin:
Daeho is Da Hu "Great Lake',
Gyeongcheondaeho is Jing Tian Da Hu 'Divine Great Lake',
Songrim is Song Lin 'Pine Forest',
Sejukwon is Xi Zhu Yuan 'Fine Bamboo Courtyard',
Jinyowon is Chen Yao Yuan 'Time Overwhelm Courtyard',
Cheonbugwan is Tian Fu Guan 'Sky Prefecture Pavilion',
Chuseonru is Qu Xian Lou 'Chosen Immortal Tower'
The secret room in Cheonbugwan has cressets with green flames. Green Flames are made with copper ion based materials and are associated with both magic and Alchemy.
On August 13, a highlight broadcast that covered the main storyline aired, and on August 14, a special broadcast with the actors of 'Alchemy of Souls' aired.
The drama went on a 1-week hiatus for episode 17 and 18. Originally, these episodes were meant to air on August 13 and on August 14. Instead, episodes 17 and 18 aired on August 20 and 21 in order to enhance the level of completion for the second half.