Both have someone who is really really into someone and idolizes them to the point of cringe.
Secret Crush on You has more couples that are in the forefront.

A story about the son of an ex-gangster finding love while battling the stigma that that past brings with it. The main guys are similar in personality and they each have a rather entitled sister, who is portrayed by the same actress. Bii sings for both dramas and even features in both dramas, however his role in Bromance is much larger.

They share the same basic storyline. There is female "goddess"-like figure who grants the main female the ability to meet 7 men with whom are very good catches. There is more of a moral to Everyday New Face.