Recommendations

SPOILER ALERT
It's also about family creating android to replace their son.

They both centre around suicide and injustice towards rape victims, they also share the social aspects of school girls and vulnerabilities towards sexual harassment and rape, the other main character is their single parent whom is ready to pay revenge to the criminals who led their children to a spiral of unhappiness and depression

It revolves around high school love between two characters. It kind of has that feel where one is smarter than the other and is thus made as a point in the relationship at some point. Both are really good high school love dramas too. With You goes deeper into the future than Attention, Love! does however.

Go Back Couple and Reply 1988 gave me the same emotion after watching them. Both dramas are so relatable and meaningful. I laughed and cried a lot watching both dramas, such an emotional roller coaster! Family, friendship, romance; all are wrapped perfectly in both dramas. (and also the theme song of Reply 1988 is played for several times in Go Back Couple)

They are both time traveler from modern day to help out the King in the past.

Although both are kinda over the top but the Journey to Tang is a bit (very) unrealistic compared to Splash x2 Love. They are both fun and amusing for a short movie/drama~

SPOILER ALERT! well not really but I had to type atleast 100 letters ;p

Anyway those two dramas are quite simmillar Fantasy/romance drama with a weird twist.

They're both about adults relationship (work environment) and the intimate scenes are hot af. DBaM is a little bit gloomy in atmosphere, What The Duck is funnier.
Both features handome actors.

They both entail a complicated love story a similar time period. Both have complicated love stories and fate tearing them apart. Both have militaristic and political plotlines carrying the story as well. These are both two love stories with misunderstandings and trials carrying them til the end.

Time travel with a film star assistant and a few others falling back in time. The assistant falls on top of a prince that brings the strangely dressed female home.

Eulachacha Waikiki and Twenty are both centered around friendship and brotherhood. Both are also very funny and contain a romance aspect.

Both dramas are OCN master pieces with a fair share of dark content. Don't expect too many 'nice' scenes since there are not any...

Both dramas show the story of resistance fighters in Korea in the 20th century and do a pretty good job at that.

Both dramas have a big amount of a psychological touch to it, giving an example of how the human brain can be influenced by mere wrong doings of someone else.

Very similar restaurant and food theme, there's also romance and characters involved in a love triangle.

Made by the same YouTube Channel, so they have similar vibes- it follows a group of young people and their different relationships.