Moon Embracing the Sun

University student, Takatsuki Minato, likes things to be clean and in order while her stepbrother, Takatsuki Toru, is a bit of a player. One day, while cosplaying as a high-school student in a fashionable district in Tokyo, Minato accidentally bumps into Toru and quickly lies about her identity. To her surprise, Toru appears to take an interest in her alternate identity, Mina, and asks her out. Thinking that she might be able to cure Toru out of his playboy ways, Minato continues to disguise herself as Mina but will she be able to keep up the charade when she starts developing feelings for Toru?

All the gods will be leaving before the last rain of doomsday. However, an ordinary human girl unexpectedly puts a dent in their plans to retreat thus causing the world to move towards the unknown. Based on the animistic mythology of the Amis tribe, the gods are no longer willing to bless the land that is plagued with environmental issues. One by one, the gods depart the world they once loved. A human girl discovers that the opportunity to reverse her destiny lies within herself and her guardian. Before the final day of judgment, a love story between human and god unfolds.

This is more like time travel, where a Joseon Dynasty scholar accidentally transports himself to 21st century into a movie set about Joseon Dynasty & falls in love . It can be considered both historical both modern and includes time travel

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.

As Oda Nobunaga's unification of Japan looms large, a mysterious religion called "Kinmekyo" spreads across the southern part of Lake Biwa. Those who do not believe in it are said to suffer a horrible curse. Determined to uncover the truth, Nobunaga secretly calls upon a masked ninja to investigate the Kinmekyo. Thus begins the tale of a young shinobi, who rises from the shadows to become none other than Masked Ninja Akakage. (Source: Japanese = TV Asahi || Translation = kisskh)

both are about kids that fall in love and are separated because of an "evil" family member (father/grandmother) to meet again after a long time when they got old.. also some young actors are the same (Yeo Jin Goo, Kim So Hyun) and I think both are great dramas with a very sad story :)

Quiet and gentle, Min Jae Yi is everything a good daughter of a prominent family should be. Engaged to the son of the Second State Councillor, Jae Yi knows that the only way to bring herself and her family honor is to accept her fate, which she does with grace and charm. Devoting herself to learning everything she needs to know to become a good wife and mother, Jae Yi dutifully prepares for the future. Sadly, destiny has other plans for her future. Four days before her wedding, Jae Yi’s family is murdered. With no one else to blame for the unexpected tragedy, Jae Yi soon finds herself the object of baseless and horrifying accusations. Blamed for the death of her family, Jae Yi might not have had much of a future at all, if fate hadn’t decided to intervene. Bringing the lonely crown prince, Lee Hwan into her life at just the right moment, Jae Yi is saved from a dismal fate, but her salvation comes at a price. Plagued by a mysterious curse, Lee Hwan agrees to help Jae Yi, but only if she agrees to help him break his curse in return. Unable to refuse such an offer, Jae Yi agrees to the prince’s terms, setting them both on an unexpected path toward love. But what chance does their love have of surviving when one of them is a former murder suspect and the other is a cursed prince?

Yu Jin was raised within the desert tribes of Xiong Nu, although her foster father is a Han. Under certain circumstances, she was forced to flee to Chang'an, the then capital of the Early Han Dynasty, changing her name to Jin Yu along the way. Along her journey, she first meets the calm and kind Mo Xun (aka Jiu Ye, ninth master) and later the handsome, cold general Wei Wu Ji. Jin Yu falls for one of them but is rejected. Will she untangle her love knot? Who will she choose in the end?

Both are historical Korean dramas that have beautiful cinemaphotography and tell a tale of star-crossed lovers. Both also deal with underlining supernatural themes.

In both dramas main leads meet when they are kids and are separated. Again they meet after long time when they are grown ups. Both are great dramas with sad story but KMHM has comedy. Both the dramas are written by same script writer Jin soo-wan, both are having great OST especially theme song.

Two children fated to be together. Where the female protecting the male in their sleep. Jealousy and evil comes along.

Both couples meet when the ML is still a prince, the FL then is assumed to have died and the ML becomes king, shifting into a harder personality. The two then meet again when the FL returns.

Both dramas contain references to the moon, and Yeo Jin Goo stars in both dramas (the ML in Hotel Del Luna and the younger version of Kim Soo Hyun in Moon Embracing the Sun).

It tells both the heart-fluttering love story and fierce obsession of a King with two opposite personalities and an assassin girl who wants to kill him but ends up falling in love with him.

Crown Prince Sajo Hyun is an intellectual character who uses his innate artistic sense to work as a fashion designer at a downtown boutique while hiding his identity of crown prince. He has a wound deep down in his heart from his childhood due to his oppressive father Sajo Seung. Sajo Hyun’s other personality Ak Hee is a charming character who can easily seduce others, but he is cursed to feel extreme pain when he makes physical touch with others.

Yeon Wol lives a life full of twists and turns, going from an assassin to concubine. Yeon Wol is the royal descendant of the fallen Yeon Dynasty and the only daughter of Yeon Poong Hak. Yeon Wol hides her identity and becomes assassin Gye Ra to avenge her family. While trying to assassinate the king, she falls into a trap set by an unknown person and wakes up the next day with no memory of her past.

The Moon that Embraces the Sun is also a historical drama just like Night's Watchman. They both have fantasy as their main genre.
They also involve Shamans. The main lead actress are both shamans.
The main actor in both dramas is a royal. In TMTETS he is a king, while he is a prince in the Night's Watchman.

Now that I think about it Il Woo act in both but in the MTETS, he is the older prince, in NW he is the younger prince.
I just kept being reminded of TMTETS while watching this drama =D