Recommendations

Shy, unpopular male lead and charming beauty. Pretty much the exact same premise.

both deal with crisis management. Things must be done as soon as possible and both movies show how time is used during dangerous situations

Both dramas have themes of reincarnation and who you are fated to meet. In Next the main part of the story is set in modern times with long flashbacks to several historical settings. We're talking 2-episodes for each flashback; they're like mini-movies within the drama. Seriously, it's worth watching just for the flashbacks.

Both series show the story about man who wants to take revenge on father of the female lead. Prosecutor Princess is more romantic comedy with a twist of revenge. Beyond the Clouds is a crime melodrama.

Both dramas is about three brothers who reunite after many years, ever since the death of their parents. Both has same main actor Lee Bum Soo, and also has general similar feeling.

Although Let's Eat is light comedy and delicious while IHYV is fantasy and intense (occasionally this has its silly moments too, mind you), they are both refreshing stories about women that work in a law firm, have developing noona-dongsaeng romance, and a vengeful psycho running amuck.

They are both gender benders with a girl dressing as a guy, both guys fall in love with the girl and think a they are gay and try to resist. Both guys even end up going to visit a psychiatrist doctor to cure them of their gayness

scarlet heart 2 is the second season of scarlet heart !!!!
so you need to watch scarlet heart and then scarlet heart 2 !!!

Very similar themes - an abusive and dysfunctional relationship and problems with family relationships

Banjong Pisanthanakun and Parkpoom Wongpoom directed both films. Both films also have a twist ending.

The director of Alone also directed the fifth story in Phobia 2. Both star the same lead actress and the fake movie in Phobia 2 is a sequel to Alone.

They are both extremely WTF, hilarious if you can handle the wtf, but horrible if you can't.

Li Chi Ling has a main role and acts well her part. It's a romance worth watching.

Both psychological dramas, both deal with manipulating other people into looking into themselves and may be changing for the better. Both have a cute and crazy lead character with a past. :)

Both main leads led cold life's and became close to awesome female leads with an ability to see dead people.

Raak boon female lead is very strong willed, feisty and doesn't want anyone's pity.