Recommendations

though the story line is totally different ... the relation between ml and fl is kinda similar in both the dramas ... in both the dramas female lead gets confusion about the affection of male lead initially ...

Both are about a cursed phone chain that tells people they will die.

One Missed Call as the name says, the chain is through a call. Whereas in A Chain of Cursed Murders, the chain is through email/SMS.

Both involves a group of friends, which one by one they begin to die.

Similar story line as the korean drama "Can You Hear My Heart" about a hero who conceals his hearing impairmentfrom the world. But the story differs completely as he plays the one who wants a revenge on his father who disowned him in childhood due to this problem. And the woman who is devoted to him and helps him find the light through the darkness of hatred.

ppl who still love each other, but something in the past had broken them up, and now they are trying to figure out if their love was strong enough to withstand time

Both have a father having a restaurant and a person coming to their life as a fake son. In both, the father has three daughters and the fake son falls in love with one of them. Both of them have Ryu Hwa Young as one of the daughters. Both are long family dramas.

Both dramas follow the main couples love through many lives.
The male lead in both shows are in a position where they hold a lot of mystical power, and the female in the current lifetime the TV show is set in doesn't remember her past with the male lead.
All in all both dramas are very similar.

Both dramas have the body-swap/body possession concept.
The original character found a clue that lead them to solve the mystery/case but before they were able to reveal it, they had an accident which caused them to die/their body to be possessed by someone else. The characters that possess the body aim to use their new identity as a detective to get away with certain things such as handling a gun, or accessing police data.

Both dramas have the body-swap/body possession supernatural concept. The characters try to approach people around their original lives, but as they are in another body, those people don't recognise them and they get ridiculed for being weird or having mental problems.

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.