Recommendations

The both have a spooky-like style and involves supernatural creatures (Hotel Del Luna involves ghost and the afterlife world while Tail of the Nine-Tailed deals more with mythological creatures such as the foxes, etc.).
The male lead of Tale of the Nine-Tailed and the FL of Hotel Del Lune both are more than 1000 years old and have a past that ties with someone important that they have lost.
Also the concepts of reincarnation and past lifetimes are an overarching theme in both shows.

1) Both include supernatural beings (Gumiho / fox spirit) as the male lead
2) Both of them have romance, humor, hidden identity & re birth
While Tale of nine tailed takes place mostly in the modern world, Gu Family book is set in the historical era.

Similarly hollow feeling to the stories. Both are captivating and easy to watch with very nice cinematography.
The main actor of “Tale of the Nine-Tailed” is also one of the main characters in “globin”, there’s even a reference to it on “the tale of nine-tailed”.
Both story’s talk about the first and only love. Both are fantasy/supernatural genre, although “the tale of nine-tailed” seems to be a little darker, in terms of cinematography.

Ignoring the fact that their names are also very similar, these two both one supernatural lead and a regular human lead for the other.
They both have reincarnation plots as well as villains who were present in their past lives.
In both of these dramas, the main lead is very confident in his abilities.
Tale of the Nine-Tailed is about a nine-tailed fox looking for his reincarnated lover and meeting a paranormal show PD.
Legend of the Blue Seas is about a mermaid who meets her lover from her past life who is a con artist in his current life.

Both dramas share similarities in the storyline and the nature of the relationship between ML & FL are the same: the FL was adopted and the ML swore to protect her. However, as they grow into teenagers, they become a bickering pair. ML develops romantic feelings for the girl who was raised to be a "sister", although they share no blood relationship. ML becomes protective and is constantly warding off all boys who get too close to his "sister".

It can be compared to " Our times " in the aspects like youth, passion , a life changing incident and love. Even though both of them have a different messages to convey, the cast in both the movies are exceptionally good which makes it worth watching. it was like they lived through the characters , i am damn sure that at least one of the scenes might have made an impression on you on different ways of viewing life. it is just a suggestion of mine.
watch it or not depends on you. a wonderful portrayal of lives awaits you. =)
HAPPY WATCHING!!!

Both adress movies that underneath all that dark comedy quite a few interesting and more serious things and are really human. Theyre also quite cruel actually, they might make you laugh alot but at the same time still hurt you. Nawapol Thamrongrattanarit knows what hes doing.

both movies are, kind of wrongfully even, marked as romance when theyre really realistic and human dramas with the same kind of comedy here and there. Get yourself some tissues ready because they really get you in your feels, even when you least expect it. Both also feature Sunny Suwanmethanon and have a similar and great ost. Nawapol Thamrongrattanarit is a genius.

Dramas have different story line though they give you feeling of rooting for main FL
1) ML always saving FL in trouble
2) FL doesn’t accept her own feelings
3) adorable chemistry between FL and ML and how they are always drawn to each other (fate)
4) strong FL and ML always backing her up on decisions

If you love romantic story and the connection between leads filled with ups and downs with life threatening situations from DOTS extraordinary you will not disappoint you.

Same nang'ek and pra'ek in both drama's. They have good chemistry together and I recommend this drama because of plot. ?

If you like the deep psychological, dark, and revenge aspects of "revenge", then watch "Girl from Nowhere".

if you like the action, blood, and revenge with a female MC, then you should watch The Witch: Part 1!

I know the dramas are kinda random, but I just want more people to discover more of Moon Chae Won's works. The few similarities of both stories include a love story where the male leads have great chemistry with Moon Chae Won, a couple whose love must face a lot of difficult challenges, one of the main leads lies to the other about his/her real identity which causes problems later. In addition, both dramas also show Moon Chae Won's character being a strong female lead, at one point we can see her saving the male lead (Bonus: the male leads in both dramas actually acted together in 2008 kdrama Iljimae, so watch that if you want to see both guys act together). I find it also interesting that the male leads in the drama also have good friends who are both very persistent in loving their own respective love interests who are reluctant in accepting them at first
For Flower of Evil Fans -> you can see in Princess Man Moon Chae Won's top notch acting, Princess Man should be the first of her other dramas you watch since she won or is nominated for more awards for this show than any of her dramas as leads (including 2012's Innocent Man).
For Princess Man Fans -> as you've seen Moon Chae Won's great acting already, you can see in Flower of Evil her most recent work (2020). It's the drama that is worthy of her acting skills and her first and most acclaimed drama after 2013.
Trivia: Producer Yoo Sang Won is a producer involved in both dramas. He also did Lee Joon Gi's 2014 drama Gunman in Joseon

Both dramas are heavy and emotional which focuses on family relationships. Go Ahead has more comedic and romantic sides while Beautiful World has mystery and school stuff.

They were both directed by Derek Tsang, Zhou Dong Yu plays the main character and they kind of have a similar vibe to me.