Recommendations

Both dramas are about forbidden love between a teacher and a student in a pre-university setting and explore similar themes.

Both are sweet stories of early love and how it stays with people even as they grow older. They are both real and raw.

The slowness of love is evident in both and is told in slow stories that are both real. They are both great human stories of love.

The directing is similar, with great lighting that creates similar tones. They both have characters that seem truly real.

the storyline started years ago between the two main caracters
serial killer in both
great alchimy between both main leads
woman chase male first in both drama

Both movies feature a mother-daughter duo in a precarious supernatural situation in which the mothers do everything to protect their children. Both also end with beautiful twists to the story.

Based on multi personality disorder and has a bit of comedy in both the dramas.
Main lead in Hyde, Jekyll,Me is Hyun Bin.

they are both tell something realistic and heartwarming. if you are struggling with your job/career, then this drama will be perfect for you

Both are coming of age stories about teenage, rough, tomboyish, rebellious, really stubborn girls. In both stories, the love between leads are deemed unacceptable. In Massaya, it's love between cousins (who are not blood related). In SKD, it's about a loving niece and aunt falling for male lead who loves the niece. Both shows even have the same actor portraying the role of a caring friendly/avuncular/fatherly-figure "prince". In both remakes (2017 and 2018), lead couples have significant air time. However, couple time is much sweeter and less frustrating in Massaya (if you skip over the grandma and all those negative characters...). In SKD, it's mainly the female lead who stubbornly stops the couple from getting together.

IOTL is very heartwarming while JBL is a bit more intense, but I think they have a very similar feel to them. If you want a show that deals with trauma and mental health in a very realistic way, then both of these shows are amazing.

Prequel to the second season. It really shows you the roots of the show's now trademark humour. A definite watch to anyone who watched the first season or who enjoys out-of-the-box comedy.

They have the same plot, except that the heir they were looking for was a girl, This was one of my favorite dramas. Highly recommended

This drama also revolves around the relationships between the people living in the same building. Each having their own difficulties and secrets and how they find support in each other eventually.

Dai renai touches on the Alzheimer's Disease topic as well though it explores more on the young onset reality

Both the series take up cases from the past that are either unsolved or criminals being falsely charges. Both are well written and emotional.