The comment wasn't because it has sad ending (not a spoiler) but because for most of us this drama started of really well but somewhere with time it lost it's beauty and suddenly it was all about toxic exs'
I was so excited to watch this after I saw one of its clip in a youtube video but it all went down the waste because towards the end drama stopped having any sense.
https://www3.dramacool.movie/drama-detail/krungthep-mahanakorn-sorn-ruk