Rock 'n' Road (2014)

There are some pretty strong parallels between the two main leads in each series plot-wise and both titles involve the music industry as well.

Both dramas ais about a music producers who meets a girl with a beautiful voice and their journey into making it in the music industry.

Both dramas have Chris Wu as the lead and he is a producer of some form in both. Also the female lead of Rock 'n' Road was also in What is Love, but played a different character.