Entertainer (2016)

Both dramas deal with the concept of aspiring idols and musicians getting second chances at realising their dreams.

story is different. entertainer is assembling of band and trying to fight politics in entertainment business/ trying to become popular
shut up flower boy band is about underground rock band who comes to limelight. make great songs. but they fall apart for various reasons.

but both have great ost. similar not exactly same kind of friendship. same feel on making album and loving music.

Both dramas are about a music agency, where the guy is the CEO of the company and falls for a girl of average standards.

Both Entertainer and Perseverence, Goo Hae Ra are about the creation of a new music band.

Beethoven Virus also has a sort of rag-tag group of musicians come together to form an orchestra in order to achieve their dreams. Both dramas focus a lot on the individual characters and the relationships that they build within their group.

dream high is similar to entertainer i feel like because they are musical students that go to school and go through hardships but end up having fun and falling in love

Both about music industry, boy group - aspiring, but struggling (Top Management)/about-to-debut (Entertainer) and their managers.
Slight glimpse of romance
Entertainer touches bit more serious matters
And finally, both starring Ahn Hyo-seop

Both stories are different but at the same time really similar. Both stories about ruined musicians/producers which found new talents that moved them. Also, both stories are about music, tragedy and love.

Both about the making and debut of an idol band containing men with troubled pasts. Both have big labels trying to stop them.

Seok Ho is a manager who finds success in raising a highly popular idol group. He hopes for more success as he plans to take his group and build his own label, but he eventually falls flat on his face. He deceives people to find his way back to the top and meets Ha Neul, who gave up dreams to become a singer after losing his parents. Having been wrongly convicted of a crime, he is in a state of despair when he meets Seok Ho. Meanwhile, Seok Ho seems untrustworthy to Ha Neul's sister, Geu Rin. To protect her younger brother, Geu Rin takes a break from her university to work several part-time jobs. But seeing her younger brother feel lifted from despair when he meets Seok Ho, Geu Rin is determined to become his manager as he embarks on an inspiring life project, the Entertainers.

Seok Ho is a manager who finds success in raising a highly popular idol group. He hopes for more success as he plans to take his group and build his own label, but he eventually falls flat on his face. He deceives people to find his way back to the top and meets Ha Neul, who gave up dreams to become a singer after losing his parents. Having been wrongly convicted of a crime, he is in a state of despair when he meets Seok Ho. Meanwhile, Seok Ho seems untrustworthy to Ha Neul's sister, Geu Rin. To protect her younger brother, Geu Rin takes a break from her university to work several part-time jobs. But seeing her younger brother feel lifted from despair when he meets Seok Ho, Geu Rin is determined to become his manager as he embarks on an inspiring life project, the Entertainers.

Mitsuru Adachi's masterpiece of a short story collection "Short Program" was made into a live-action drama starring the global boy group JO1. For the first time, all JO1 members will take on the lead role in one of the eleven carefully selected episodes. The episodes of this diverse youth romance drama are packed with various elements, such as music, sports, and action. Where will the eleven boys who are chasing their dreams go?