The Moon That Rises in the Day (2023)

859 AD. The once-great Tang Dynasty is now declining. Numerous rebel groups have formed, the largest of which is the House of Flying Daggers, based in Feng Tian county. They steal from the rich and give to the poor, gaining the support of people. The local deputies have managed to kill their former leader, but the rebel group only becomes stronger, due to a mysterious new one. Jin and Liu, two police captains, are ordered to kill the new leader within ten days.

Han Joon Oh is a leading South Korean celebrity. He is stunningly good-looking and tall but is secretly plagued by an inferiority complex that leaves him permanently insecure. One day, he is hired to appear in a public service video. But the shoot goes horribly wrong, and Han Joon Oh is involved in a potentially fatal car collision. He is only saved by the quick thinking of a female firefighter named Kang Young Hwa, who pulls off a heroic rescue.

Han Joon Oh’s representatives hire Kang Young Hwa to work as the star’s personal bodyguard, recognizing her incredible talents. But when Han Joon Oh awakes from his stupor in the hospital, he has changed completely – as his body has now been possessed by the spirit of a nobleman from ancient Korea. This nobleman, named Do Ha, was killed by his beloved wife Han Ri Ta – and the vengeful spirit is on a single-minded quest for retribution…

Han Joon Oh is a leading South Korean celebrity. He is stunningly good-looking and tall but is secretly plagued by an inferiority complex that leaves him permanently insecure. One day, he is hired to appear in a public service video. But the shoot goes horribly wrong, and Han Joon Oh is involved in a potentially fatal car collision. He is only saved by the quick thinking of a female firefighter named Kang Young Hwa, who pulls off a heroic rescue.

Han Joon Oh’s representatives hire Kang Young Hwa to work as the star’s personal bodyguard, recognizing her incredible talents. But when Han Joon Oh awakes from his stupor in the hospital, he has changed completely – as his body has now been possessed by the spirit of a nobleman from ancient Korea. This nobleman, named Do Ha, was killed by his beloved wife Han Ri Ta – and the vengeful spirit is on a single-minded quest for retribution…

Han Joon Oh is a leading South Korean celebrity. He is stunningly good-looking and tall but is secretly plagued by an inferiority complex that leaves him permanently insecure. One day, he is hired to appear in a public service video. But the shoot goes horribly wrong, and Han Joon Oh is involved in a potentially fatal car collision. He is only saved by the quick thinking of a female firefighter named Kang Young Hwa, who pulls off a heroic rescue.

Han Joon Oh’s representatives hire Kang Young Hwa to work as the star’s personal bodyguard, recognizing her incredible talents. But when Han Joon Oh awakes from his stupor in the hospital, he has changed completely – as his body has now been possessed by the spirit of a nobleman from ancient Korea. This nobleman, named Do Ha, was killed by his beloved wife Han Ri Ta – and the vengeful spirit is on a single-minded quest for retribution…

BOTH MALE LEADS HAVE BEEN LIVING/ AROUND FOR MORE THAN A THOUSAND YEARS
FLs KEEPS GETTING REINCARNATED AGAIN AND AGAIN DUE TO THEIR TRAGIC CURSE FROM THERE FIRST LIVES
Both MLS hold grudges against FL about there past tragic FATES BUT( THERE'S MORE TO IT WITH SOME INTERESTING TWISTS in The Curse of LOVE SERIES).
THEY WANT REVENGE AGAINST FL IN CURRENT TIMELINE
ALL OF THE HIDDEN SECRETS UNRAVEL OVER TIME THAT SPANS MORE THAN A THOUSAND YEARS IN BOTH STORIES

Han Joon Oh is a leading South Korean celebrity. He is stunningly good-looking and tall but is secretly plagued by an inferiority complex that leaves him permanently insecure. One day, he is hired to appear in a public service video. But the shoot goes horribly wrong, and Han Joon Oh is involved in a potentially fatal car collision. He is only saved by the quick thinking of a female firefighter named Kang Young Hwa, who pulls off a heroic rescue.

Han Joon Oh’s representatives hire Kang Young Hwa to work as the star’s personal bodyguard, recognizing her incredible talents. But when Han Joon Oh awakes from his stupor in the hospital, he has changed completely – as his body has now been possessed by the spirit of a nobleman from ancient Korea. This nobleman, named Do Ha, was killed by his beloved wife Han Ri Ta – and the vengeful spirit is on a single-minded quest for retribution…

Both are fantasy dramas and both ML has a similar background. ML and FL have a significantly big age gap in both dramas.

Han Joon Oh is a leading South Korean celebrity. He is stunningly good-looking and tall but is secretly plagued by an inferiority complex that leaves him permanently insecure. One day, he is hired to appear in a public service video. But the shoot goes horribly wrong, and Han Joon Oh is involved in a potentially fatal car collision. He is only saved by the quick thinking of a female firefighter named Kang Young Hwa, who pulls off a heroic rescue.

Han Joon Oh’s representatives hire Kang Young Hwa to work as the star’s personal bodyguard, recognizing her incredible talents. But when Han Joon Oh awakes from his stupor in the hospital, he has changed completely – as his body has now been possessed by the spirit of a nobleman from ancient Korea. This nobleman, named Do Ha, was killed by his beloved wife Han Ri Ta – and the vengeful spirit is on a single-minded quest for retribution…

Korean emperor Lee Gon tries to close the doors to a parallel world which was opened by demons; a detective tries to protect the people and the one she loves.

In the romantic-comedy "Boku to Star No 99 Nichi", top Korean actress Han Yoo Na falls in love with a quiet man named Kohei Namiki. Kohei Namiki is a single man approaching his 40's. He works part-time at a security company. He has a sweet and handsome appearance which some people take advantage of as he is easily swayed by those around him. Kohei often takes care of his sister's three kids because his sister has a habit of wandering around. He is a passionate man and dreams of finding his star, but because of his family and economic situations, Kohei can't follow through on those dreams.

One day, Kohei is assigned security detail for the beautiful actress Han Yoo Na. Even though she has a near perfect appearance and style, she prefers to act like a normal person. She enjoys eating simple Japanese foods, and on the filming set, Yoo Na goes out of her way to help others. Yoo Na has a pure and kind spirit and seems to be the envy of all. Inside, however, Yoo Na is lonely working in the entertainment field and she has a big secret.

At first, bodyguard Kohei and top star Yoo Na don't get along. With time, they become closer. Over the next ninety-nine days, their relationship changes. But on the hundredth day when the contract ends, what choice will they make?

This drama is a love story between Kataoka Sakuya, a grim reaper who comes to the human world for the first time, and Mochizuki Nayuki, a woman who lost her father at a young age and has devoted her life to raising her only remaining family—her younger brother. As they meet, they gradually come to understand each other, and slowly, they begin to fall in love. However, a fate that will dramatically change their lives awaits them both…

Both stories have a similar plot line of past lives being entwined with modern day reincarnations and deal with fate as almost a secondary character. Very similar in vibe as well.

I found no similarities besides the firefighter role. But I love both. As for Moon in the Day, it goes far back to the previous life and less rescue scene. I believe Fireworks of My Heart has more ‘rescue scene’ than that one^^

A popular teenager inexplicably finds herself in the body of an unpopular classmate - and her body's new owner has no intention of switching back.

The series centers on Ayumi Kohinata, a first-year high school student who has a cute and shy personality. She's excited that she just started dating her first boyfriend, but on the day of their first date, she gets a mysterious call from her classmate Zenko Umine. Zenko says she's going to die, and Ayumi witnesses Zenko jumping from a building. The next thing she knows, Ayumi wakes up in a hospital, but in Zenko's body.

It is believed that when a person dies, their soul spends 49 days in Jungcheon, or Purgatory before their eternal fate is decided - heaven, hell or rebirth. That's where accomplished demon hunter Yi Kwak finds himself as he lies on the edge of death in our world. Blessed with astounding swordsmanship and the uncanny ability to see the evil spirits invisible to most, Yi enlisted with the royal squad of elite demon exterminators, the Chuhyongdae, following his fiancee's tragic death. In Jungcheon, he finds Yon Hwa again, but she does not recognize him - she is a spirit of the afterlife now, severed from earthly memories. Moreover, she is deeply entangled in a great war between the white-clad warriors of reincarnation and a swarm of dark spirits determined to forever shatter the cycle of life and death. The battle is desperately close to a terrifying conclusion, so Yi must draw his sword to defend the woman he loves and all they hold dear - and confront the same soul that was once like a father to him.