Recommendations

Both female leads are once in a popular girl band. The female lead in The Greatest Love is still in the entertainment industry whereas the female lead in One More Happy Ending has fade out from the entertainment industry.

Both story is about the female lead taking up another person's identity.
The female lead in Who Are You: School 2015 take up the identity of her twin sister whereas the female lead in Mask take up the identity of a female with an identical face as her.

both took place in a high school, with a theme of youth and togetherness, both emphasized love for music as a path for unity, lacks romance but it hits you in the right place through the heart

Both are about a poor country girl who lives alone with her grandmother. She decides later to move into the city.

Takumi-kun Series (1-5) are BL movies with a comparable mood to them. Manly because they have drama, but are mostly positive and sweet. (With the exception of some tragedy in the 2nd Movie, if I remember right). Both have the school setting. Even though you will have to be prepared. Seven Days has the better acting. However, relationship wise the Takumi-kun Series has more depth and action going on.

in both dramas, the main girl-lead passes the test to work in the palace. The male-leads both hate the girl-leads but fall in love with them slowly.
both have really good stories and lovely music.^^

Both female characters have non functional relationships which sent them to cheat their partners.

same love story happening inside the company. a love triangle dilemma.

These dramas resemble one another because they have the same feel. It is a rom-com with some melodrama elements, but it has a lot of humor. The leads are also both very naive; we also have big company background and family problems.

While Sailor Zombie stars AKB48, if you're looking for more female idol filled dramas 'Innocent Lilies' and 'Innocent Lilies 2' might be for you. The plot are both rather dark, and end with a similar feeling.

The first season of the drama Thumping Spike 2. The drama's main cast is different.

This drama is a Historical drama and it's also starring Lee Joon-gi as the 4th Prince Wang So.

Both are train themed shows that are rather lighthearted and both are by the same writer.

- Both high school dramas.
- SUFBB main characters are part of a rock band. SGG main characters are part of a cheerleading squad.
- Both have rivalry between two groups.
- Cute romance for main and side characters.