I get it that this show didn't meet our expectations but I don't think it deserves 1 as the rating. Atleast it's watchable. But tbh there were some bothering scenes like yoo jung beating drunk JCW and JCW's mother beating his father, if the same was to happen with gender swaps then it would have become a controversial subject
At the start of episode 8, Han Jae Hyun said that he found out why she made that choice back then.Do you know…
I don't think it has to do anything with finding out rather he just realised how tough it must have been for Ji Su when her mother and sister passed away. Also, her father was left with no will to survive and started having delusions.
Their families finally came to understand them. Jae Hyun gets divorced and then main leads live happily together. Also, each character had a happy ending in their own way, as for the evil ones, they paid for their sins. Jae Hyun and his ex wife ended things on a good note while Ji Su's ex-husband felt guilt for his wongful doings and became a better person.
https://www3.dramacool.movie/drama-detail/krungthep-mahanakorn-sorn-ruk