Pure Heart Lotus

I'm Looking for a Quick Travel Novel Where I Don't Know the Name or the Heroine, It's Not a Fanfic.

The second volume in it is about the heroine trying to make the hero fall in love with her, and the hero has a cousin in his heart. The heroine pretends that she also has a sweetheart in her heart, who is the heroine's cousin. Later, the male protagonist and the female protagonist got together. There was a side story where the female protagonist was with her cousin.