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Ninako Kinoshita is a high school freshman with no experience in love. When she meets Ren Ichinose—a handsome boy who’s popular with all of their female classmates — on a train during their commute home, she starts encountering him more regularly and gradually develops feelings for him. However, Ren already has an older girlfriend. As the relationship of these two is explored, several other people in their lives must deal with their own feelings of unrequited love.

Ninako Kinoshita is a high school freshman with no experience in love. When she meets Ren Ichinose—a handsome boy who’s popular with all of their female classmates — on a train during their commute home, she starts encountering him more regularly and gradually develops feelings for him. However, Ren already has an older girlfriend. As the relationship of these two is explored, several other people in their lives must deal with their own feelings of unrequited love.

When she was a middle school student, Yoshioka Futaba liked Tanaka Kou, who was unlike the other boys and quite gentle. Kou then moved away, and they lost contact.

At the end of Futaba's first year as a high school student, she meets Kou again. Kou’s name has changed to Mabuchi Kou, and his personality seems different from his middle school days.

Ninako, who has an honest and gentle personality, lives her days without yet knowing the feeling of love. One day, she bumps into her classmate Ren on the train on her way home, and gradually becomes drawn to his hidden kindness. Ninako feels a pain, as if something has stabbed her in the chest. Eventually, she realizes that her feelings are "love," and she makes up her mind to tell Ren how she feels.

Ninako, who has an honest and gentle personality, lives her days without yet knowing the feeling of love. One day, she bumps into her classmate Ren on the train on her way home, and gradually becomes drawn to his hidden kindness. Ninako feels a pain, as if something has stabbed her in the chest. Eventually, she realizes that her feelings are "love," and she makes up her mind to tell Ren how she feels.

Ninako, who has an honest and gentle personality, lives her days without yet knowing the feeling of love. One day, she bumps into her classmate Ren on the train on her way home, and gradually becomes drawn to his hidden kindness. Ninako feels a pain, as if something has stabbed her in the chest. Eventually, she realizes that her feelings are "love," and she makes up her mind to tell Ren how she feels.

Ninako, who has an honest and gentle personality, lives her days without yet knowing the feeling of love. One day, she bumps into her classmate Ren on the train on her way home, and gradually becomes drawn to his hidden kindness. Ninako feels a pain, as if something has stabbed her in the chest. Eventually, she realizes that her feelings are "love," and she makes up her mind to tell Ren how she feels.

Ninako, who has an honest and gentle personality, lives her days without yet knowing the feeling of love. One day, she bumps into her classmate Ren on the train on her way home, and gradually becomes drawn to his hidden kindness. Ninako feels a pain, as if something has stabbed her in the chest. Eventually, she realizes that her feelings are "love," and she makes up her mind to tell Ren how she feels.

Both dramas are about the leads in parallel/different timelines - ML in the future, FL in the past - communicating through a cellphone.

Both are about the ML in the future communicating with the FL in her school days in the past through a cell phone.

The story is not similar but the chemistry and acting are great in both. Match Play is about an actor and his stuntman while Killer Next Door is about a killer and his friend from highschool. I just wished both dramas were made into a full length drama instead of a vertical format one. Nonetheless, I think you'll enjoy both.

In both head over heels and khemjira a beautiful shaman has to save the person she/ he loves from a death curse.

Both fantasy/xianxia dramas.
Both have to collect stones/relics that are related to different emotions in different scenes.

The only similarity here is that everyone thinks the FL is evil and nobody likes her. But they get switched (one jumps in a novel, the other has a twin). And everyone noticed that the FL is different and actually really caring and nice.

If you liked different princess, you’ll like The inextricable destiny. Only because they both have the same FL and she has the same personality vibes which is young and lovable and does what she wants.