Both have a royal who has multiple identities. One is aggressive and one is more docile.

Difference is WUTF has a female king who has DID while in LSFI it's the Crown Prince who eventually becomes king. Both kings...

Plot of Love in Devil sounds pretty similar to TTEOTM...
But one is short length series and other a full length drama

Very different kinds of dramas but upon rewatching Come and Hug Me, I realized the ML's way of taking care of his sister in the past reminds me of the ML in Ugly Alert.

That and the fact that the ML is misunderstood due to the actions of a family member and there being a murder that caused this misunderstanding makes both dramas slightly similar to one another.

Ugly Alert is more focused on family and has a much slower plot compared to Come and Hug Me tho.

Both star Raymond Lam in a wuxia setting.....
Both star Tavia Yeung as well.
TOB definitely has more comedy and less serious leads in the beginning

Man Transmigrates into the past and gets into a relationship with two women. Both whom have statuses above his own.

In both, ML is seemingly an immortal. Romance between immortal and mortal. FL is also seemingly a reincarnation in both.

ML is raised to be a killer and then is forced into a revenge scheme against a group of bad people. CH is much less dark compared to KI and has a ML that doesn't actually kill compared to the ML in KI.

Seems similar in that both have a human general who gained powers and lived to a more modern era. At this point I'm gonna assume the FL in TYFY is the reincarnation of the goddess who gave ML his powers by sacrificing herself which is in a way similar to how FL in Fairyland Lovers gave ML the bracelet... allowing him his more unique abilities.

In both dramas, there exists a person in modern times who looks exactly the same as another from the 1930s. The person from the 1930s basically switches places with the modern version of himself.

The way the FL motivates ML to grow and change for the better is very similar!
In Chef Fang, ML is initially known as a major playboy (though obviously kind at heart) but then his parents arrange a marriage with the FL and he slowly starts becoming smarter and a martial arts expert.

In Court Lady, ML is known as the number one playboy but once he meets FL he begins demonstrating his immense talents and begins to work hard to improve himself overall.

Both dramas are basically a time loop between two parallel timelines. The events of Leap Day led to the FL traveling to the timeline in 940920. Her actions in 940920 helped create the backstory of YKC in Leap Day. Which in turn saved her life in Leap Day and led to her ending up in the parallel timeline in 940920. It's complicated lol

Both deal with the theme of reincarnation and have a strong supernatural element.
Only on episode 3 for now but Bulgasal is definitely a bit darker and has less of a romantic side.
TONT deals with deities while Bulgasal monsters.