It is similar in a sense that it is a marriage between a minor girl (a high school girl) and an adult guy.
In MLB, they got married because of a grandfather's wish. In PJK, they got married because the husband is conscious that people will say something if he pursues only a relationship with a minor, so he chooses to marry to make things official and protect the girl by making her his wife.

They are similar in a sense that in both movies, the "marriage" had to be kept a secret from school and classmates. Only family and some close friends know of the "marriage". Both families have approved of the said marriage.

Only difference is on MLB, the girl purposely had a relationship with another boy just because she cannot accept the marriage as it is. But on PJK, the girl cannot accept the fact that her husband is a policeman and is always in danger.

Both are cute and are just on the getting to know you stage since it involves high school girls.
Recommended by pinkvanilla
Both movies focus on forbidden love.
In Kinkyori Renai it's about teacher/student relationship while in P to JK it's romance between a police officer and 16 year old student.
Recommended by Badass Bunny
Both are about older man and younger woman
Both are Japanese movie
Both are cute and sweet
Worth watching
Recommended by Chia6
Age differences. Older man and you g girl. Can that happen? Is it sin or roman? What she needs to learn? Family to decide?
Recommended by Chia6
Following a failed confession to her first love, female high school student Mikoto Ochiai contemplates jumping off the roof of the school building. However, her thoughts are interrupted by the arrival of Jin Haiba, the physics teacher known for being a slacker and the butt of students' jokes. Calmly, he lights a cigarette and asks for an explanation of the events that led her to this precipice. Rather than dissuade her from killing herself, he makes a request—will she enter into a romance with him before she dies? Together, the two gradually ponder why they should keep living and why they should not love each other in earnest.
Recommended by 73n5h1k015h173
Both MLs are policemen, and the FLs are in school/still in training when they meet the MLs.
............................................................
Recommended by emeraldarrows
Same actress on both movies. Very beautiful couple. Strong male lead. The stubborn love. Beautiful romantic love story
Recommended by Chia6
In sweet 18 the ML is prosecutor, while in P to JK ML is a police officer. Both dramas have an older guy falling for a younger girl, both are cute stories and both have cute couples. I really love both dramas, I think if you like Sweet 18 you will probably like P to JK as well ^_^
Recommended by IceTea_Aiste
The girl in both stories is a high school student who went to a meeting instead of her older sister. When the switch is discovered by the male lead, he doesn't want to give up the relationship with the younger girl.
Recommended by ohmyseoul
High school girl and adult hero relationship. Both Japanese and both full of romance. I like watching Japanese romance movies and I really enjoyed these. If you want to dream and you do not expect a lot, I recommend you to watch them.
Recommended by montsedrama
Both girls in both movies are really young. The men in the movies are much older and working men. The girls just need to grow older and mature
Recommended by Chia6
Both were Japanese movies. Both female leads were high school girl. The men actually wasn’t that old. But the girl needs to grow older, mature and more life experience
Recommended by Chia6
Both female leads were young and beautiful. Growing and learning without much life experience. Worth watching. Beautiful movies
Recommended by Chia6
P to JK (2017) poster

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