Both dramas have the same feel although I haven't finished Reunited Worlds and I don't wanna spoil 9 Seconds (since it's a short series) - both have time travel/time stop theme

If you like the time-travel themed movie and drama, "Vanishing Time" is a must-watch.
The plot twist are different however they have the same feel.

Both female heroines can see ghosts
Although Spellbound is more on the lighthearted rom-com, both drama and movie are worth watching

Both female heroine can see ghosts
Although Black is truly a serious crime-drama-fantasy, The Master's Sun is more light-hearted, romantic drama
Both dramas are worth watching!!

Let's not forget the original Japanese drama starring Tomohisa Yamashita.
Time travel - romance - comedy

Both female heroines are not interested in the lead guy at first but then have a change of heart and both male lead actors have the same feel of pursuing the girl
Sexy rom-com

The male leads are both super rich and dominant
There are some food shots in the movie but the feel is the same with tons of city shots of Macau
Both romance but quirky way
Great movies with awesome actors!!

Both culinary-themed with tons of delicious mouth-watering food shots
Both male leads are gorgeous and yummy to watch :))

Both cooking themed
Both female lead actors are working hard in a restaurant
Both are perfecting the "vongole spaghetti"

Both cooking themed drama
Both dramas have the same feel - lighthearted, the same beautiful lighting, the same beautiful restaurant
You will enjoy watching both dramas!

They're both cooking themed drama
Both heroines are trying to win the approval of the male chef
Both fun to watch

Both main leads are long-time friends, however in OMHE they lost in touch but reunited in the end. Both great rom-com, handsome strong male lead yet very charming and lovable. Female lead is strong yet damsel-in-distress like.