Well, a common feature of a typical romance manhwa is the focus on the emotional journey of the couple. There's usually lots of cute moments, maybe some obstacles they have to overcome together to strengthen their bond. Also, the art style tends to be very appealing, making the characters look charming and the settings dreamy.
I think the ideal protagonist for a manhwa romance could be someone who is brave in facing challenges and shows unwavering loyalty in love. They should have a unique background or story that adds depth to their character and makes the romance more compelling.
For a romance manhwa to be good, it needs a compelling storyline. This could involve obstacles the couple has to overcome or a unique setting. Also, the art style plays a big role in creating the romantic atmosphere.
For me, 'Daytime Shooting Star' stands out. The characters are well-developed and the romance is heartwarming. Also, the plot is engaging and keeps you hooked.